I put some photos in the gallery awhile back.
This way works but it is a bit of a pain to get perfectly lined up. The pin is reversed then epoxied in. I also made one with a larger bearing that replaces the stock wheel and clips right into a modified hub, but I used a lathe and a home made inside cutter to modify the hub and make the axle, eventually I will make the other side.
Never tried to put any in the stock motor mount, but all of the custom mounts I’ve made have them and they do make a difference.