I wish it was that simple of a fix, I had a steering cable brake. I was stuck in a mud flat chasing some real shallow fish. I had to use the outboard and got off the flat and off the lake. I took the TM into the shop and got a call today the unit had a really strange noise in the motor. They ran some tests and had to get in touch with MG but the motor may be toast or at least it may cost more to fix than what I'm willing to put into an 8 year old TM. I won't really have an answer until Wednesday when they can talk to the right guy at MG to see if they can diagnose the problem.
About that speed switch....I don't think it was bad, I think it's just the way it is. A friend of mine had a 24v Tour and his was pretty much the same.

A way to describe the switch was if it was a clock and the switched moved from 7:00 to 5:00 (clockwise). When spun the dial on the speed control, the prop didn't move until 10:00 and it didn't get any faster after 3:00. All the other mothing was useless.

I'm just trying to get some idea on then new TM's out there. I'm sure MG had to improve that dial or at least I hope the did. I hope I get some feed back on some of the new stuff out there. the only thing I know is I know I don't want a power drive and would like to stay with a 12v.