I hope you all will permit a question from a non-scientist seeking some practical guidance on a vintage table saw restoration. I have a 1930s era table saw whose 5/8" shaft spins at 4500 rpm inside a porous bronze bearing that is lubricated with SAE 20 oil. On the motor pulley side of the shaft, there is a shaft collar with set screw between the pulley and the bearing. This shaft collar prevents the shaft from making excessive lateral movements. But it seems to me to have drawbacks: 1) if the face of the shaft collar is not touching the bronze bearing, there is opportunity for some lateral play in the shaft, and hence some play in the blade; or 2) if the face of the shaft collar is touching the bronze bearing, there is considerable friction Therefore, I thought that a self-lubricating thrust-washer could be inserted between the shaft-collar and the bronze bearing. The shaft spins inside the thrust washer, if I understand correctly. Am I going down the wrong path? If this makes practical sense, is there one type of thrust washer that would be better suited than another for this application? E.g. oil lubricated bronze: http://www.mcmaster.com/#thrust-washers/=id6ev6 or PTFE/oil impregnated: http://www.mcmaster.com/#thrust-washers/=id6fba or bronze or graphite? http://www.mcmaster.com/#thrust-washers/=id6ftv Here's a crude sketch to orient you. And a picture. Thanks for sharing your engineering knowledge with a guy who studied ancient languages in college!