One tip that helps out is NOT to have all the parts tight. I dont mean real loose but just a little. This help it move alittle smoother. Loosen the top cross bar and the top caps of the injectors. This should help out with stickyness. I have the original one and it is pretty smooth as you can see in my videos. I actually have a set with steel shafts and linear bearings for the top of the injector. Now that set is smooth all the time. Hope this helps Frank