[Benson]

Wick,

I have seen this recently on a rebuilt distributor. It was caused by missing .030 and .015 shims under the upper end of shaft.

These shims were put on bottom of shaft instead. The result was that the rotor rubbed on top of the points arm as shown in your photos.

NOTE: because shims were missing from upper end of shaft , the shaft was too low, SO rotor rubs on point arm.

My problem was that as rotor rubbed on the TOP of the Original style arm of points, the spark was very "flakey" and points burned rapidly as the points contact was "made and broken" repeatedly while points were supposed to be closed!