The windlass is pretty much back together. I still need to re-tap some bits that were deformed from the beating it took to get the thing apart.
I made up some springs that seem to be working ok. The picture below is the test spring I made. I cut it short and stretched it a bit at a time until the ratcheting action felt right. 100mm seems to be about it. It’s still not perfect but it’s at least working now.