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Thanks so much.I am also exploring the rear axle set up on an adult tricycle. The gearing is such that i may not need to go electric.Of course this is still way more than a 4 year old can handle so my sister's 7 year old grandson will have some fun.
Would it be possible to post more pictures of the steering mechanism? I think i got the wrong size rod end bearings. Looks like you used male rod ends.