Will the RBC be floating, or will the axle go thru the ends of the drum?
I might add some foam along with the media disks to decrease the weight on the shaft however I have not decided how much weight I want to dissipate vs. how much media surface area I want to sacrifice yet. I might not decide that until closer to the end of assembly once I see how much weight will be on the shaft and how the plastic needle bearings will wear with that much weight.
As far as how the shaft is going to be secured, the inside shaft is going to slip inside of 1" PVC flanges attached to the inside of the barrel. The joints of the 2 PVC flanges will remain unglued.
I'm thinking the entire barrel RBC assembly will sit inside of a rigid wooden frame that should prevent the plastic from expanding outward and making the shaft slip off of the flange joints. I am also considering (most likely will be) adding a set-screw to the flange/inner shaft joints.
