Hello Mr.Professor, and thank you for your interest in my modest achievement. Originally I wanted to keep the same diameter as the suspension arm
which gives this

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Then, reinforce the upper chassis with 1.5 mm aluminum, replace the plastic rollers with ball bearings, it can be difficult to install

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Initially, I had adapted HL motors, but wanted to reuse the Tam “Barbotins”? found used 2 Tam engines,
HL motors

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Tam.motors

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in order to have the two sides parallel, I cut a U-shaped aluminum plate fixed with 2 mm screws
Made, a radio compartment in 3 mm ABS, in order to be able to extract everything for possible troubleshooting, photos to come (the small rear box is the HP)