Bicycle seat post (30mm) trailer hitch mount for bike trailer
thingiverse
This is a mount for a trailer hitch. If it is strong enough.... the future will show ^.^ If not.... i will be maybe pour it in aluminum if my skills in metal casting will evolve ;o) Seat post (how is it named in english?) has 30mm diameter. The needed screw is an M8. This design maybe not fit perfectly for your needs. But FreeCad file is included!
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