I have had success with 3D printing a replacement bushing with TPU. I'm impressed with the strength and durability of TPU compared to other filaments I have used. If anyone wants details or needs one PM me. Easy and cheap to make.

Did you post the stl file somewhere?

I've been using ones cut from a silicone mat.

I haven't posted it anywhere yet. PM me and I can send it to you.

I looked at trying to buy polyurethane sheets but it was hard to find and expensive. Is the silicone mat durable?

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init9999 said..
I haven't posted it anywhere yet. PM me and I can send it to you.

I looked at trying to buy polyurethane sheets but it was hard to find and expensive. Is the silicone mat durable?

Sent you a pm

The silicone sheet was much cheaper than pu. Has worked fine for a few months so far....

I use rubber strip from Clarks. www.clarkrubber.com.au/products/strip-insertion-6-0-x-25mm. Maybe a bit grippy, but works.