I was going to suggest to whoever has an ear with the manufactuers of these bikes, try using assembly grease on the nuts and bolts as stripping my bike, I have lost count of how many bolts and captive nuts have sheared due to being rusted in. Also, the bolts used do seem to be a bit soft, anyway, I am slowly replacing the nuts and bolts with A2 stainless steel, smeared in copper grease, perhaps expensive, but this thing has got to last, and be relatively trouble free for the next two years at least.

Oh, and the number of sheared bolts has given me plenty of scope to try out new methods of removing the stuck portions, my latest and most successful, is to centre drill the broken bolt, then bang a torx bit into the drilled hole, apply penetrating oil, or mini blowtorch, depending on where the problem is, then get a spanner on the hex shank of the torx bit and turn, it has worked so far. An idea gained from the Snap on extractor set I used to have, it used sort of torx rods and slide on torx nuts that one could turn with a spanner, the best extractor set I ever had, pity the ex sold it along with £4k of my snap on tools.