OKay whats a delrin sleeve? The alt bearing is on the tube, it rides on 4 little roller things made of teflon that are 120 degrees apart. The centre bolt is just there to hold the tube onto the sides of the base so it doesnt come off, as well as providing a little friction to hold the tube in balance. Not sure why they did this, but each to their own. The three feet I got lathed up at work, look like the Skywatcher ones but made of aluminium. Not sure what the SW ones are made of, rubber I guess. I will post some pics later of the progress after I fix my stuff ups because of being tired.
oh the base board is round too
