Rob, that is exactly what is was. Wrapped the belt around the capston and it seems to work well.
@mads0100, Unfortunately, the STT shutter is different from the the STF. For what it's worth, I had a shutter problem on my STF (that I used to have) when I operated it at the 13.8 volts that my setup uses. I eventually figured out that I could make the problem go away by reducing the input voltage to the 12.6-ish volts of a fully charged battery.
Craig