Lawn mower tightener
thingiverse
I've made this thing with Tinkercad. You can edit it online at https://www.tinkercad.com/things/8j4MkeIEQQK It's 11mm in diameter inside, 20mm wide on the outside in one place, and 40mm wide in another area on the outside. To do anything, I used a mix of different carbon fibre copolymers and some ABS materials.
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