Hi all. My son has a Rossi M92 in .45LC. He has not fired it yet but has cycled it to check function. The cartridge stop has an intermittent issue of not functioning. No matter how soft or hard I work the lever, the stop works then it doesn't. In order to get it to work again, I have to use a flat tip to push in the stop and re set it. Youtube has plenty of videos on the matter, but I don't trust myself to disassemble it without losing something. Anyone have any experience with this and can give me and the boy a hand? Hickman Rifle didn't want to touch it because of Rossi's crap replacement part and warranty policy. Thanks in advance for any help!

Jim