Just use the TeamC TC02T/Hyde... or Ansmann Macnum bones, shafts etc...
Loads on eBay cheap and worked well on my KF ST.... see first post...
http://www.ebay.co.uk/itm/New-Team-C...wAAOSw0vBUY3GL
http://www.ebay.co.uk/itm/Team-C-Hyd...wAAOxy0QtR-8-4
Bit expensive trying to use Kyosho parts!
Oh and a ball diff helps take the strain off the belt... I have one for sale if anyone needs one