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#13894643 - 06/12/19 Lyman aperture in Williams sight.  
Joined: Feb 2009
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John_Boy Offline
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John_Boy  Offline
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Henderson, Texas
Boys I need some help.
My old Mauser came with a Williams rear sight but without the aperture.
I've got a spare Lyman but it won't thread in more than 1/2 a turn, or so.
They are supposed to be threaded the same. 7/32-40
Any ideas short of chasing the threads?
It might be simply a case of too much paint in the threads.

Last edited by John_Boy; 06/12/19.

I am the way, the truth, and the life: no one comes to the Father but by me. John 14:6
300 BP

#13894716 - 06/12/19 Re: Lyman aperture in Williams sight. [Re: John_Boy]  
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gunswizard Offline
Campfire 'Bwana
gunswizard  Offline
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Here's a bit of useful information that will save you money and may solve your problem. 7/32-40 is a special thread that is hard to find and costly, #12-40 on the other hand is a common fine thread size that is commonly employed with lock hardware. It is commonly available and is not a costly item. There is only .002" difference in the major diameter (outside diameter) of the two threads, not enough to make any difference. I learned this lesson several years ago when I was considering making sight aperture discs. Hope you find this little kernel of information interesting and of use. MSC Industrial Supply and McMaster-Carr both carry #12-40 taps & dies, you would want a bottom tap to go in the shallow hole in the Williams sight. Inexpensive carbon steel tap & die will work fine for a one time job, no need for High Speed Steel.

Last edited by gunswizard; 06/12/19.
#13894722 - 06/12/19 Re: Lyman aperture in Williams sight. [Re: gunswizard]  
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John_Boy Offline
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John_Boy  Offline
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Henderson, Texas
gunswizard,
Thank you.
That's the kind of information I'm looking for.
John


I am the way, the truth, and the life: no one comes to the Father but by me. John 14:6
#13894751 - 06/12/19 Re: Lyman aperture in Williams sight. [Re: gunswizard]  
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John_Boy Offline
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John_Boy  Offline
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Henderson, Texas
Here's the project.

[Linked Image]

[Linked Image]

[Linked Image]


I am the way, the truth, and the life: no one comes to the Father but by me. John 14:6
#13895122 - 06/12/19 Re: Lyman aperture in Williams sight. [Re: John_Boy]  
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gnoahhh Offline
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gnoahhh  Offline
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Annapolis, Md.
I have a 7/32-40 tap. (Easy to find if you know where to look- model railroading emporiums. I paid $7+change for it.) PM me if you want to borrow it.


"You can lead a man to logic, but you cannot make him think." Joe Harz
Alpha

#13895690 - 06/12/19 Re: Lyman aperture in Williams sight. [Re: gnoahhh]  
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John_Boy Offline
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John_Boy  Offline
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Henderson, Texas
Will do.
Thank you for your help.


I am the way, the truth, and the life: no one comes to the Father but by me. John 14:6
#13898302 - 06/13/19 Re: Lyman aperture in Williams sight. [Re: John_Boy]  
Joined: Aug 2012
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5thShock Offline
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5thShock  Offline
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Would this be more expensive than the taps, dies and fuss?

https://williamsgunsight.com/product/williams-twilight-aperture/

#13898846 - 06/14/19 Re: Lyman aperture in Williams sight. [Re: 5thShock]  
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John_Boy Offline
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John_Boy  Offline
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Henderson, Texas
Takes all the fun out of it....
Midway has them for $9.95 but shipping jumps it up.
I bought a new one from Graf for $8.95 when I ordered brass and slugs for the 8x57.
It was a Lyman that won't thread in. It's supposed to work according to the Lyman web site.


I am the way, the truth, and the life: no one comes to the Father but by me. John 14:6
#13901144 - 06/14/19 Re: Lyman aperture in Williams sight. [Re: John_Boy]  
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5thShock Offline
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5thShock  Offline
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Got a strong lens to check for a rolled thread or some other tiny catastrophe?

#13904535 - 06/16/19 Re: Lyman aperture in Williams sight. [Re: 5thShock]  
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John_Boy Offline
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John_Boy  Offline
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Henderson, Texas
Well it's not the sight itself.
It's the new, just purchased aperture.
The thread start has a burr.....
Return, or get out the file???
It only cost eight bucks.....


I am the way, the truth, and the life: no one comes to the Father but by me. John 14:6
Bravo

#13905400 - 06/16/19 Re: Lyman aperture in Williams sight. [Re: John_Boy]  
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John_Boy Offline
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John_Boy  Offline
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Henderson, Texas
Not the burr.
Diameter of this one - .0221
Diameter of the one that fits - .0198


I am the way, the truth, and the life: no one comes to the Father but by me. John 14:6
#13905453 - 06/16/19 Re: Lyman aperture in Williams sight. [Re: John_Boy]  
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Idaholewis Offline
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Idaholewis  Offline
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N. Idaho
I have several Lyman 57 SML Tang peeps, and a few Williams, The Williams Apertures will thread right in the Lyman’s perfectly, But a Lyman Aperture will NOT go in the Williams.


“Absolutely nothing is good enough if it can be made better. And better is never good enough if it can be made best." Author Unknown
#13905475 - 06/16/19 Re: Lyman aperture in Williams sight. [Re: Idaholewis]  
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John_Boy Offline
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John_Boy  Offline
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Henderson, Texas
Agreed.
Yet their web site chains they will.
The caliper says they won't.


I am the way, the truth, and the life: no one comes to the Father but by me. John 14:6
#13916082 - 06/21/19 Re: Lyman aperture in Williams sight. [Re: John_Boy]  
Joined: Jun 2019
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Hotrod_Lincoln Offline
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Hotrod_Lincoln  Offline
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Victor Machinery Co. has 12-40 taps and dies at reasonable cost. I've been buying machinist's tooling from them for several years. They list the 7/32-40 tap on the website, but not the die.

www.victornet.com

Jerry


Ignorance can be fixed. Stupid is forever!
#13916719 - 06/21/19 Re: Lyman aperture in Williams sight. [Re: John_Boy]  
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John_Boy Offline
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John_Boy  Offline
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Henderson, Texas
I talked to a local friend who is supposed to have a tap that will work.
If not I'll check into these sources.


I am the way, the truth, and the life: no one comes to the Father but by me. John 14:6

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