If the hub/drum is not sliding onto the spindle of your Timbren Axle-Less system, there will be one of two things causing it.
First will be some kind of obstruction on the spindle that the inner bearing is getting caught on. You will need to make sure the spindle is completely smooth with nothing sticking up or out from the smooth surface.
If that's nice and smooth, you will most likely just need to tighten the brake pads down. Some times they can be spread out fairly far when we receive... view full answer...
The depth dimension of the faucet part # PF213246 that would be in a shower box like where it would be mounted is 3-1/4 inch from the back to the end of the quick disconnect or 2-5/8 inches to the top of the handles. I attached a picture of the black version of this. view full answer...
When installing spindle nuts like what comes on the Timbren Axle Less Kit # TASR5200S03 Timbren recommends tightening the nut to 50 ft lbs and then backing off 1/8 turn. view full answer...
The Lock N Roll Articulating Hitch # 336VS503505 can do a rise/drop of 4-1/4 inches but there isn't a way to allow this to also have a dual ball mount design on it like you asked about. So to cover that you'd need a different adjustable ball mount like the part # AM3411 which has a similar rise/drop but has the two ball sizes you need as well. It's pretty uncommon for the dual ball setups to have the 1-7/8 inch and 2 inch ball but this one does so it would be your best option. view full answer...