Whats it for ?

[torizus]

I took off the side plate on a 1905 and there was that little screw attached to the cylinder bolt. I seen one before, along time ago and never figured out why it was there. It is under the side plate, it doesn't connect or secure anything.

Why it be there ???

[walter o]

Does not that screw keep the spring loaded plunger from popping outwhen you remove the cyl lock ?

[glowe]

Yes. The spring and pin kept the thumb latch in a forward position so the cylinder would automatically lock in place when closed. There was a flat section on the pin and the screw limited travel in the slot. Normally you need to remove that screw in order to take out the thumb latch slide.

[Hondo44]

The spring and plunger are actually to push the bolt (and thumb piece) forward so the bolt locks out the hammer and action from functioning with the cyl open.

The wide part of the bolt where the screw is located moves forward under the pointy rear of the hammer so it cannot be cocked. That's why with cyl open, if the thumb piece is pushed back, the action will function for diagnosis of action issues by eliminating the cyl from the equation.

This method replaced the 1st action lockout on the yoke shaft which locked out the trigger on the very earliest 32 Hand Ejector Model of 1896 that did not have a thumb piece or cyl bolt.

[torizus]

Got it, thanks guys.