I have a Yugo M70AB2 underfolder that was built on a NODAKSPUD NDS-4 receiver, and using a Tapco G2 single hook trigger kit. The problem was not occurring at first, in fact I had zero problems for the first couple years and thousands of rounds. Now I am having a "hammer follow" issue. The hammer is not re-setting. I see that Tapco is saying that their G2 single hook triggers are not compatible with NDS-3 and NDS-65 receivers, and NDS has the same thing posted.
NDS has a fix on their page, troubleshooting page
Is this the only fix, filing a bevel on the hammer? Should I order and try a double hook to correct the problem. Any insight would be appreciated.