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If the coil diameter is .500 inch, the position of the hole will be on the circle created around the center of the pivot at a radius of 1/2 the diameter (or .250 inch).
If the coil tip for the blade hole position is at 0 degrees at rest, measure the position the tip would be at 36 degrees and drill it (for 10% pre-load). On a clock, if the tip of a right-hand coil spring was at 12:00, put the hole between 1:30 and 2:30 (depending on load preference) Remember, overloaded springs do not last as long, but they fire hard when new. (vice-versa on less load)
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Alex Whetsell
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Atlantavirtual.com
Atlanta NOC
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