All good advice here
WWAG gave the barebones of it with:
Sync them at full draw with an arrow on the string, or just a nock, and your release for best results
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Also I' ve found that it' s best to NOT synch using the cable loop end to make adjustments. Use the Split harness on the other side (i.e. if your top cam needs work, do it at the split on the bottom). Make an even number of twists on each side of the split harness, to avoid messing with cam lean.