So, with the help of a screwdriver and nearly cutting a finger off in the process…somehow I managed to wedge it into the corner with some pokes, scrapes, and scary plastic sounds.
I also managed to get one roller assembly on, but I basically had to loosen all the bolts with bearings into “hand tightened” and pull the bearings UP to allow the pipe to slide underneath and make contact with the 2 pressed-in bearings.
With some work, the side with 2 bearings will slide back down so that full contact is made on the bar. The bad news is the side with the single bearing now teeters on “barely nut on” because the bearing slides right to the nut and only touches the railing with about 1/4-1/3 of the bearing width.
Should all 3 bearings sit flush with the rail? or should all 3 be slightly off and using the edge to contact the rail?