What is the easiest way of installing an o-ring in a shaft assembly. I have an assembly that requires installation of different sizes of O-Rings on different pins or shafts in an assembly. I had been using the insertion of planes to do this but I find this to be time consuming. Is there some other tricks out there? It would be nice if I can just use the Concentric and Coincidence for relationship but this does not work on O-Rings.