Home Forums Hunting & Shooting Hunter's Campfire Help... metal work guys re:Tap and Die.

A good day to you all here.
I find myself in a bit of a bind here. I am trying to restore an old Stanley router plane, and the threads in one of the blade locking holes is damaged. I believe that running an appropriate tap through it should rectify the issue, but the bolt used is an oddball, namely a UNS 3/16 - 28TPI.
I can source taps to do the task, but being very unfamiliar with all of this, am in a quandary when confronted with different tap types. Three types are available, a tapered tap, second tap and a plug tap.
Which one do I need to do this task?
Any help, advice or enlightenment on this topic would be greatly appreciated, and I thank you in advance.
Regards,
Aussielad.

If it's a thru hole the tapered would work and be easiest to start,if it's blind hole the plug will get you threads to the bottom.

Thanks, yes it's a through hole.
Appreciated

If you can't repair the hole by running a tap through it and have enough room to make the hole the larger this insert is an alternative...



I'm not a big fan of heli-coils.

That..

A plug tap is the mid one, if you want to get to the bottom, use a bottom tap.. That sounds like a standard 10-28 tap

Stanley planes do not use standard threads. They had their own oddball sizes.
Probaly going to have to drill old threads out and retap hole with larger size.

Neil