Bike handlebar ends
thingiverse
Use a tough material that is resistant to UV and high temperature. You can paint them to avoid UV exposure. Three versions: - with a hole (bike handlebar ends.stl); - without a hole (bike handlebar ends V2.stl) - no need to add a cap. Instead of V2, you can just use brim on V1 and not remove it from the hole; - bent slightly for curved handlebars (bike handlebar ends V3) . About 10 cm long (without the mounting part). For 11 mm diameter of the handlebar. Use M6 bolt + nut and washers to mount.
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