[AT] OT: Cast iron work on a replica cannon

[STEVE ALLEN]

Gentlemen,

I am very grateful for the flow of ideas here!

I am especially grateful for the offers of help.

Let me clarify a couple of things.

First, the current (worn out) threads are 1/2" -20.  I had planned to go to 9/16" -12 if I have to drill out the hole and rethread; I have looked at a helicoil for 1/2" -13, both under the impression that, in cast iron, the coarse thread will wear better.  The bolt through which the vent is drilled would have to be replaced in any case unless I use and insert fro 1/2" - 20 again.  I should pint out that eh bolt is removed and re-installed before and after each time the gun is used (not each time fired but each event it goes to) in order to mount and de-mount the hammer for travel.  I don't know if regular removal and retightening influences the best repair plan or not.

Looking and the key-locking inserts, the literature says that the keys will lock the insert in place in soft materials, but it references aluminum.  Will the keys be useable in cast iron?

Thanks again for all the support!

The "original" Steve Allen
(Just Steve, please:   my father was Mr. Allen)