wybron forerunner calibration guide


ive had a hard time finding this out but i know it can be done.
dose anyone have a guide that would fit into the front slot of a forerunner that would have a mark on it that would, when properly calibrated would line up with a seam in the gelstring when the scroller was a a certin percent.
i knew a tech who had one and said he figured it out for himself but right now i could really use one, so if anyone has such a device (peice of cardboard with a line on it) i would love it if i could get a quick how too guide on how to make one


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