We purchased a Milescraft 1303 Drive90PLUS right angle drill adapter from Amazon to see if it would work as a 90-degree adapter for FRC applications.
The Milescraft adapter is slightly more compact than the DeWalt, and it uses bearings instead of bushings.
We unscrewed the main handle form the miter gearbox and pulled the snap rings to get to the internals of the mechanism. They appear to be sintered gears which are weak under impact, but for many FRC applications, this should be acceptable. There aren’t any thrust bearings in this device so you shouldn’t be pushing against either in the input or output features either.
We haven’t used this on a robot yet, but it’s a useful tool to have in your design toolbox.