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Ordinary seat post shims are flexible enough to work in this application, that's how I got a 28.6 stem on my 27.2 post.
You actually need 0.9mm wall (28.6-26.8=1.8), so the shim which is designed to fit a 25.4mm post in a 27.2mm tube. The end gap opens up by about 4.5mm but that's not really a problem.
0.9mm is a bit thick to bend at home without proper tooling, it will end up 20p shaped, so I'd probably avoid that.
Your local machinist can make a custom turned and slotted sleeve, if you can find one who can be arsed with very small job shop work, or there are a couple of people on here with home lathes who might help.
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Coke can route sounds dodgy, but actually works really well.
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I dont know if you resolved this, but 11/8”=1.125 inches=2.8575 cm
Which is as close to 28.6 as you can get. Have you tried fitting the stem?
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gbj_tester
Fatbiker
Simba
@se1derful
Anyone know of somewhere that does custom milling services or cheapish aluminium or steel sheet?
I need a really weird size shim for our tandem stoker stem, and it looks like custom is the only way forward. 26.8mm seatpost needs to fit a 1 1/8" stem, so looking at 1.2mm diameter/0 .6mm thick.
I'd really rather not go down the coke can route - if anyone has any suggestions they'd be warmly received.