Rotor and Cap Continuity?

I have noticed that on a rotor spring with sharp top edges, it can scrape off the center contact in the cap, when wiggling the cap to get it on. That of course destroys the center contact and leaves carbon dust on the rotor and inside the distributor. The carbon dust conducts electricity and could cause arching.
When I could not find a replacement rotor without the sharp top edges, I filed them to remove the burr and make them smooth. As another precaution, I turned the rotor position to point at a side clip so that the cap would slide parallel to and on top of the spring, instead of across it, if the cap needed to be wiggled to get it on and the clips snapped in.
Some rebuilt distributors have tight fitting caps and it is difficult to get them on while in the vehicle. Good parts are hard to find. Buy made in USA, if you can find them.
Richard