Fascinating thread. I’ve purchased a couple of the alibaba motors that have a high stall current and I’ve failed to make them work witht he maslow shield. So, I decided it probably best to take them apart and learn about the innards. Just looking on the forum for a suitable place to put them, and I discover this most comprehensive thread. I doubt there is much that my pics can add to the commentary, but I’ll post them anyway. One interesting difference is that all the gears in mine are metal and the spacers all brass. I think mine was sold as a 1:280 ratio box, but I didn’t bother counting teeth when I had it open. A word of advice to anyone taking one apart, make sure the front plate of the box comes out of the bottom of the box, otherwise you’ll end up with a lap full of cogs and silicon grease. I ended up taking the second apart to learn how it all went back together! These gearboxes appear quite well made, but I’d question how long any plastic/nylon gears would last if hauling a heavy sled/router around for a while. While apart, I noted that the motor to gearbox mounts were 22mm apart, so it is quite possible to get another motor and mount it to the gearbox. I’ll be keeping these as spares, should I have a gear strip or other gearbox failure. 
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