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Here ya go:
Advance Curve Change Kit. . . . . Part No. 29014
Required to change the amount and rate of
advance within a range of 14° to 28°. Includes
degree keys, springs, and instructions to plot
advance curves.
As an aside..........do you have a bunch of advance springs in a drawer and don't know which is the "lightest" one?
Take two springs and hook them together, end to end.
Pull on each spring in opposite directions.
The spring that begins to separate at the coils first is the weaker one!
PS-On my Unilite, I just placed the lightest springs in the kit and didn't change the total advance.