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Well eccentric shims are definitely a thing (https://www.sjscycles.co.uk/gear-spares/thorn-eccentric-front-mech-shim-286-to-349-black-plastic-hand-finished-split/).
Resurrecting a thread. I bought a shim by BBB -
https://www.ebay.co.uk/itm/193783485114?chn=ps&_trkparms=ispr%3D1&amdata=enc%3A11urcGh3tSaCS1b2zKU4Z_g89&norover=1&mkevt=1&mkrid=710-134428-41853-0&mkcid=2&itemid=193783485114&targetid=1394813963940&device=m&mktype=pla&googleloc=9045944&poi=&campaignid=14473496295&mkgroupid=129498654911&rlsatarget=pla-1394813963940&abcId=9300649&merchantid=231863231&gclid=CjwKCAjw2P-KBhByEiwADBYWCnxIpEp7jGLjUtn6yODPtmoieBApOLohB8_9vhvWDzLOuvl6pXfBPBoCDnwQAvD_BwE
It seems to be eccentric on that it is not the same circumference all the way around, there is a ridged section. I can't see how it is supposed to work. Surely both the inner and outer surfaces have to be completely circular?