I had a question on the GRP collet that came with my tuned .21. I installed the collet and then put on my losi flywheel. The flywheel did'nt seem to seat properly or go all the way back so I went ahead and put on the losi collet and it seems to work fine. I guess my question is do you have to have a certain collet for each brand of ctutch system? Because the grp one definately didnt seem right with my 2.0 flywheel.