Glad you got it going and sorry for not responding to your question or observation about the two different measuring systems.
As bearings I ones use are mostly China made. I just add extra grease to the seal versions. Even some those idler pulleys can have extra grease added using a needle injector.
I wouldn't have half the tools I got if it wasn't for the two systems. Personally the metric system make it a lot easier as everything is base 10 where the SAE system is all over the place. What get me is the hybrids where they use both metric and SAE on the equipment. You get one set of tools out to do the work and end up with sets out. At least these are the main two measuring systems; glad there isn't more to deal with. Even with the ones we have the there are oddities that we need to be aware of.
Now with all new styles of tools we just end up needing more tool storage. I just recently had to buy E-sockets which are external Torx. I also had buy a set metric wrenches that cover sizes that normal metric wrench sets don't have as I needed the 24mm and 27mm wrenches. At least I have not needed to get into the 3/4" or 1" drive stuff yet.
The worst here is trying to obtain metric fasteners even being located next a major NASA facility which does everything in metric. Even they made mistakes and use the wrong measuring system when programming equipment.
