After some experimenting, I'm using aluminum outers and stainless steel thin wall tubing for the inners. Al on Al works, but does wear fast and the inners look bad quickly. You've really got to be careful of weight, especially the smaller you go, so tubing is your friend. After many, many hours I just finished gear and retracts for the He-111 in 1/13 scale (I do have a machine shop). The gear took about 3x as long as it would take to just scratch build the rest of the plane, but they are scale in look and exact scale in function.... Do you have any good scale drawings and reference pictures? I can probably provide some guidance.
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