I bought a rifle in a pawnshop with a torn piston. Probably the piston cap was not securely fixed at the factory, that's why the piston was torn off. These are the consequences, the thread of the piston cap was worn out, I did not find any other damage, the thread on the piston is intact. I only ordered a new cap. The rifle is in mint condition, this is evident from the blueing of the piston. They tried to repair the rifle, but they could not disassemble it completely, they also could not reassemble it correctly, since the rifle is very complex in design and experience in repairing these rifles is needed. Many parts were lost during assembly and disassembly. The missing parts did not turn out to be a problem and I ordered new OEM ones. My question is the following, is it worth putting the cap on the thread lock? I am afraid that there is some invisible defect in the piston and the cap will be torn off again, will it hold reliably? Or maybe use JD glue or epoxy?