You must have a earlier version than mine. The progression was roller bearing, pinned roller, no roller!
The roller shouldn't take any large forces, only the weight of the unloaded jack. Once the jack is loaded the spring should compress so that the jack's frame is taking the load to the ramps. Therefore for the bearing to break something else might be wrong. I don't know where to get replacement parts other than Bendpak, but you might try to find a suitable sized bearing to use instead, or if you have a lathe just machine a simple non-bearing roller.
As for Bendpak failures I had one of the cable pulley shafts come out when my FGT was up on the lift. I was lucky and manage to massage it back into place. So much for a factory installation!
