I am rebuilding a transmission I bought to swap out in a 75 TR6. Current counter shaft ones making terrible sound. When I pulled the top off to clean I had to drill out the plugs that hold the detent balls. Now I realize am unable to find replacements. All I know is Moss Motors for parts. I see that some had a screw in type plug instead of press in like I have. Is there a source where I can get the press in kind or do I need to see if I can get a machine shop to thread the holes and make me some screw plugs? If that the route I need to take I have some of the mangled plugs I removed I can measure so they can make them.