[Gaz64]

With any distributor cap, whether it has a spring load brush and a fixed rotor contact strip, or a fixed carbon brush and a spring steel rotor strip, you should be be able to "feel" the spring tension as you put the cap on.

I like to see the cap sit up a fraction on it's own weight on one side, then I know the contact is made, before clipping it on.

A lot of caps don't do this.

MSD suffers a lot of "dust" from dry centrifugal advance weights, poor rotor phasing, arc welding with dissimilar metals, and overheating the carbon brush since there is a low resistance brush available.

Gary