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Today we assembled the transmissions, and they had several issues. First, the roller pins did not go in very easy (i think the hole was a tad bit too small) and they "unravelled". We got the first one in with some persuasion, but it had some "mushrooming" that we had to squish back so the gears would fit. The second transmission was even worse. The fist pin bent, and when trying to remove it, we accidentally broke it off. We drilled out what we could, then tried another one in hopes that it would push out the remains of the first. The second one got bent, but we got it out and finally got the third to work.
The second issue we had was the small gear for the second stage in one of the trannies wasn't quite big enough to fit on the shaft, so we had to sand a little on the shaft, but it is still a press fit.
Our third problem was one of the pinions was way too tight to fit on the cim. It was so tight we had to put it in a vise and persuade it (i know this is bad for the motor, we were already planning on ordering extras. We were in a bit of a hurry, we wanted to finish our prototype drivebase.).
Other than these assembly problems, i really like the Toughboxes. They are simple, and plenty strong. They are also an improvement over the older AM single speeds, being symmetric and all. I think our current plan is to reduce them to single stage gearboxes for the competition drivebase.