I am the owner of a Model 1907, an early model made in 1911, according to the S#. I have fired it, but on the last outing I noticed I had 2 misfires. The firing pin did not strike the primer hard enough to fire it. Upon inspection, I noticed the firing pin retainer, on top of the sear mechanism was cracked and no longer holding the firing pin spring correctly. I would like to know if that part is available. Thanks..