keyshunter
Contributor
Cleaning rope out of fishing boat wheels is also a fast way to make a few hundred, but you will have to get very good at it. Fishing boats tend to melt the rope into a poly blob. It takes sharp chisels (wood chisels) to cut the blob, and you don't want to mar the shaft.
I did some of that when I was a lot younger. I found that a close quarters hacksaw worked well for some blobs, but it was important to be careful not to contact the shaft.