General discussion > Gun Building
Strengthening a Main Spring?
Bob Gerard:
Can an existing Main Spring be strengthened (and the Feather Spring as well)?
I have a new-to-me flintlock pistol with a rather crude lock. It sparks and shoots OK, but certainly not great. The springs are very light- too light I think, to produce a good spark. I've had it for two days and feel unsatisfied with the lock's reliability. It is a recreation of a 1690 French Dragoon pistol from The Rifle Shop.
Can these existing springs be re-tempered or what ever a good gunsmith does to make springs? I guess a new main spring could be forged but not sure about the Feather Spring because of its unique design.
Thanks very much for any ideas and suggestions,
Bob
rich pierce:
Preload can be increased on a frizzen spring. There’s little actual compression. To do that it’s heated bright red, spread by maybe 1/8” more, hardened and tempered.
How low below the lock plate would the mainspring hook be if free of the tumbler and completely relaxed? In my limited experience a new, thicker spring is a better solution than increasing preload. Cabin Creek is the go-to shop.
Bob Gerard:
Hi Rich,
I have not disassembled the lock yet to see how much the Mainspring opens. I did take your advise and emailed Cabin Creek Muzzleloading to see if it is something they would work on.
Thanks very much for your advise!
smart dog:
Hi Bob,
You may be able to heat it red hot, open the main bend a little and give more arc to the lower leaf. However, if you alter the spring make sure the lower leaf is straight when the lock is at full cock. A very slight upward bend is OK but straight is better. Don't be afraid to alter the spring, harden and temper it and then test it. If it still isn't right reshape and heat again as many times as you need. Contrary to what some would have you believe, springs can be hardened and tempered many times without damage if you do it right. For TRS springs do not quench in oil. Quench them in brine, which cools them much faster without risk of cracking. They are not very high carbon steel and oil quenching tends to create mushy TRS springs. Temper at 750 degrees for at least 30 minutes, an hour is better.
dave
Bill in Md:
interesting thread
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