I think because there are only a handful of people active on this site, the threads sometimes blend together into the overall conversation. So off topic posts happen. It's like getting a small group of people together in a room to celebrate someone's birthday. They are also going to talk about...
The rise also affects your position on the bike and the reach. You want the sweep angle to be comfortable to your wrists. The Jones bar that I use has a 2.5" rise and a 45 degree sweep:
The Rivendell website has a lot of different styles with good descriptions on how they affect the fit of the...
Not long ago, I watched a teen or young adult on an analog bike cut diagonally across a busy intersection against a red light. He didn't even slow down approaching the intersection. Of course a bad driver in a car is much more dangerous and there are just as many, if not more, of those.
For the front disc problem, loosen the bolts securing the calipers to the frame a little, squeeze the lever to center the calipers on the disc and re-tighten the bolts. The calipers can get out of center if you remove the wheel and put it back on a little differently than when it was originally...
The Phaserunner and the standalone version of the Baserunner controllers are fully potted for water proofing. That might be a good investment for him even if it is a cheap bike.
Yeah, I don't use the tip scrubber on it. All you need is the slotted part and it is kind of a one trick pony. But it is good at that trick. And it's small and easy to store.
I have one of those alligator clip third hands. Not as fancy as that one though. The one I have was kind of fidly to use. I saw this on Amazon for $10 and bought it on a whim. It works really well:
I have no idea what the actual problem is. You need to troubleshoot what is wrong. But once it is fixed, you shouldn't have to deal with it again every ten days as you said. Parts do eventually wear out, so most likely you will have to deal with skipping again in the future.