I managed to mod all 4 of the hubs to fit the Jato shafts (changed the bearing setup) and wound the pivot balls in till everything was sweet. Then broke one of the (obviously) **** quality GPM shafts in half by hardly even touching it!So sent the buggers back for a refund and decided that for the cost of some better shafts it was cheaper to do the (already tried and tested) method with TMaxx parts. (gotta love EBAY) So are halfway through that mod now! Later on if I come across some (good) Jato shafts cheap I may go back to it.