I have a 5 speed, 12v M/K troll motor that I would like to convert to a variable speed. The #1 setting is too fast to spiderrig/tightline in the winter and I have tried wind socks, chains etc. (too much trouble). Looked at some of the PWM units on E-bay but not sure if these would hold up for all day trolling on #1 speed. Any info, experience or comments on trying to do this would be appreciated.