if you have the o rings come out cut a small piece off fuel line and stick it in there. i have mip cvd on my rustler and have had them for a long time and ive only had the pin slip out so i grinded a flat spot in the pin so it wouldnt slide out and put heat shrink tubing over the pin as a boot, my cvd is also starting to oval out a little but where the cvd connects to the axle but its from over time and big .18 engine in there but i say there a good investment