You didn't do anything wrong when you built it. eventually all the rods get cracks near the guide feet. Usually if its bad too soon , its because you wrapped too far up the foot.
I just cut the thread right near the guide foot. Just enough to start unwrapping. I don't try to cut all the thread off as there is a good chance of nicking the blank. After you unwrap the thread , solvents , sandpaper (fine) and sometimes scraping will get the rest off. If you are going to rewrap in exactly the same spot , you don't have to get every speck off.
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