I have used a combo square to get centerline but still check with string just in case it has a small bend end to end.
I’ll get a full draw sometime , much other stuff happening!
I need to back up a bit, before checking with string you have to lay out nock location. I clamp a yardstick on limb while limb is full width and for 58” I mark 29” from center and square a line across limb. Gives you a good starting point for nock grooves.
Then measure 5/16 off string mark and a couple inches past fades and draw it on there. If I built the same bow more I would make a template from phenolic to mark limb with !
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