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There is no need for a machine shop for any of this. Just a little elbow grease. All you need to do is cut the spacers with a hack saw, and make sure you file it out afterwards. It doesnt need to be perfect, but make it as close as you can to the actual measurments. The stock for the spacers was provided in the cardboard box with the 2x4 aluminum extrusion. As for the keys, just cut them with a hacksaw (slightly smaller then the width of the gear) and hammer them into the shafts keyway. then slide the gear over and use a mallet to hammer it down the shaft. Thats what our team did. We have a machine shop, and the gearboxes needed no machining. The thing that needs the most machining in my opinion would be the shafts, which I chamferred and faced off, it makes it much easier to get the gears and bearings on the shaft.
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