John,
On Ebay one can find all sizes of the Mec Powder bushings made of hard plastic, and a fraction of the cost of the MEC ones. Apparently made on a 3D printer. I bought one of every size I did not have. They sell one or a dozen and get cheaper the more you buy. They work!
https://www.ebay.com/itm/11508678764...Bk9SR-DBx9fNYg