Just use a rubber wheel to control the thermostat. It's much more reliable than a belt.
Use some rubber that is flexible enough that it doesn't break or scratch the thermostat wheel.
Here's a quick drawing of what I mean:
(Image is public domain)
Just use a rubber wheel to control the thermostat. It's much more reliable than a belt.
Use some rubber that is flexible enough that it doesn't break or scratch the thermostat wheel.
Here's a quick drawing of what I mean:
(Image is public domain)
Mechanical is just to risky. Electrical relays are the way 
