I recently became the owner of a late 70's to early 80's era charter arms model 38 'undercover' origionally owned by my deceased father in law. The main-spring, firing pin and such were removed and lost at some point. i have all the parts except for the mainspring seat. Any leads on where i can get one, (my local gunsmith was unable to find one after 4 months with the gun)or if there is a modern gun with compatable parts, it would be greatly appreciated as this is very sentimental to the wife. Thanks.