http://www.chiefdelphi.com/forums/sh...threadid=16944
Digikey does carry other multi-turn pots. Look under Potentiometers - Wirewound.
There are a few
300 degree potentiometers. You cannot use that one, though, because they only come in 25K Ohms. You need 100K Ohms. Search around the entire catalog and see if you can find another 300 or so degree pot.
The other option is to take a standard pot and stick a gear on it.
*edit* The second item on that link, 1/8Watt Carbon pot, is a 300 degree pot and comes in 100K Ohms. However, the wattage might be a bit too low (you'll find your pots burning up). The manual states 50mA max, which means you'd need 5*.05 = 1/4 Watt potentiometer.