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Springs aren't going to effect any advance at idle. Springs will only effect how quickly the advance comes in as you increase the rpm. There should be a small hole on the side where you line up a tag which you can bend to limit the amount of advance. The only way to accurately find 0 tdc is with a adapter screwed into the plug hole. It's easy enough to make your own. Take out the center of an old plug and weld in a stud. Screw it into no 1 plug and rotate the engine until it stops, and mark the balancer, rotate engine anti clockwise until it hits the piston, and mark it again. Then exactly halfway between the 2 is tdc..
Then center punch the balancer. Marking the timing marks with a liquid paper correction pen will make it easier to see the marks with a timing light.
JD
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