mvh said

Yeah, the dual points have an adjustable vacuum pot. You unscrew the nipple and there is an o-ring and a short stack of washers, or one thick washer. But I have never come across any info about how you actually adjust these

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1. The spring (stiffer softer)
2. The limiter ( more or less total advance)
3. The washers (when the advance starts to come in)