I have been finding out about washers. I have MDF pivot arms, holding PTFE disks (instead of bearings). To enable my pivot arm to rotate freely, I shall put 2 washers between the MDF surfaces (because both are poor turning surfaces), and one between the MDF and the nut on the arm's pivot and between the MDF and the PTFE disk and between the PTFE disk and the nut.
As an aside, apparently steel makes a good turning surface but aluminium does not.
I shall use 2 nuts together for each of the bolts on the arm's pivot and the PTFE disk.
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