Hello,
I had flagged
https://www.allplastics.com.au/engin...-plastics/ptfe as a possible source, not sure how little you can order or anything about retail sale/supplys etc.
Option B was buying a teflon chopping board.
and
https://swiftsupplies.com.au/ptfe-sheet-range is cheap thin covers, not sure if they work, but at .15mm cover and its only the surface contact your after...
(240mmx240mmx.15mm Virgin ptfe $8.23)
Steve
PS. Try and get your hands on a copy of "The Dobsonian Telescope" Kriege/Berry, that will have a formula for how much teflon contact area you need for the weight of the scope base bearings or tube assembly bearings.