I got it in the mail today, but haven't tried it. It is designed to mount to a reloading bench, or a piece of wood that you can clamp to a bench.
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The primer comes with large and small primer adapters (The things with the springs on them), two mounting bolts, a primer tray and instructions.
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Everything goes together easily. It is similar the Lee's handheld primer in that the LG/SM primer adapters and shell holder slide into the red tool body. The primer tray is used for any size primer. No need to swap out LG and SM trays anymore. It slides into place as well.
There is a little spring on the LG and SM adapters that is called a primer agitator. I assume you flick this with your finger in the event the primers bridge.
The plastic primer tray opens up and the contents of any manufacturer's primer box can be dumped into it. The little ribs to flip the primers is built into the tray. Once properly oriented, you fold and close the tray.
With previous Lee primer tools, the primers could slide out, unless you kept your finger over the primer feed ramp. With this, they incorporated a ON-LOCK-OPEN switch.
Set to OPEN, the tray flips open into a square and the primers are dumped onto it.
Once the primers are oriented correctly, close the tray and set it to LOCK. You can insert the ramp into the tool without the primers coming out.
Once it is in the tool,, set the switch to ON and they will slide onto the plunger.
The only thing I see that might be a problem is the ON-LOCK-OPEN switch. It may wear or break, but I suspect if this is a problem, replacement switches will be cheap.