I have a Model 99 that was built in 1922 that was handed down from my great grandfather. I am interested in locating a lever bushing and lever bushing screw that connects the lever to the receiver. The pair I have is stripped to the point that it barely stays together. I'm not sure if this is a standard thread that can be dressed in such a way to make it hold better, or if a replacement is the best idea.

How tough are these to find?

Thanks in advance.