Hope this helps. Had a 2180 years ago that always had the flat spot, would set the points to .016" over and over, no help. Mentioned this to a VW sage locally and he asked if I had checked the dwell, to which I replied it was a VW and not a SBC, no dwell specs or adjustment in the distributor. He then enlightened me to set it at 48-52 degrees dwell by playing with the point gap. Lo and behold the man was right, took out the flat spot and from then on I set them all with a dwell meter. Alas, I got out of bugs for about 20 years and no longer have a dwell meter, but if you can find one try that. Made a believer out of me.
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