If you find one, you want a "new" one, I think you can tell the difference in that the newer ones you can change course in 1deg increments. Whatever you find, call CPT and ask their
advice.
I believe a CPT's limit is around 50 ft lbs, that is
boat size is irrelevant, but if it takes more than 50 ft lbs to move the
wheel a CPT isn't going to
work, but 50 ft lbs is a lot.
Verify that 50 is the number, not sure it's just what comes to mind.