[Ron Ramirez]

The small wheels do have grooves, or more correctly, rims which the O-rings will fit into. Sort of like putting solid rubber tires onto wheels. You'll have to do some scraping of the wheels to get out as much of the old rubber as you can before installing the new O-rings, unless you know of some sort of chemical that will remove rubber from metal.

As for the large rubber piece on the dial hub, I don't know...I suppose any glue that can make rubber adhere to metal will do...I haven't (yet) had to do that part.