check out www.toyodiy.com
get parts from northridge toyota, free shipping and way cheap parts.... my local dealer wanted $85 for some nuts and bolts i needed, northridge did it for $31 shipped to my door, email their parts manager, there is a link here somewhere
Cool site! They seem to think this is the part:
![](http://lh3.ggpht.com/__oixf95iq-g/SidF3tnZSqI/AAAAAAAAA88/ozKoK_R3n60/s800/variable_resistor.jpg)
But that's the actual slide assembly, which isn't what Marlin described.