panic:"It's the same 13.33° for both (720° ÷ 54 teeth = 360 ÷ 27 teeth) because of the cam turning 1/2 speed with twice as many teeth. I'm sure this is a good compromise of maximum error vs. smaller teeth (weaker) but it makes corrections by skipping a tooth an "extreme only method"."
Well duh, Two meshed gears with a 2 to 1 ratio. Dopy me!
The three slot sets still turn up on eBay from time to time as do the straight cut gear sets. It might be easier to make the crank gear adjustable with a flanged sleeve though it would be much harder to access.
