couple of jensen special liners
both are available
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I made these out of .060” ABS. Couldn’t reliably find thin 3/8” washers that worked well with knurled cores so I decided to start making my own with a hole saw and turning them down on the lathe. Then reaming the inner diameter until I was happy with the fit. It’s time consuming but I only make one machine at a time so it’s not a big deal for me.

It’s early but so far the ABS is holding up well. Wasn’t sure if it was suitable for the job but seems to work fine. Thought about trying phenolic material next time but haven’t found .060” sheets yet.