Fixed
Using a bit of logic I reasoned that if the spinning could be reversed by sliding the trim control then the spinning couldn’t be caused by anything in the prop drive trains, the problem therefore must be with the electronic components. So I fished the copter out of the bin took it apart and removed the circuit board. Using a loupe I couldn’t see any obvious problems with componentary, but without the appropriate testing equipment, and of course the knowledge to do some logical fault finding I opted to replace the circuit board. Luckily I happened to have a spare so I soldered the three motors in and an extra battery then stuck it back together; wahl ah – success, no more spinning. The second battery is located by means of an elastic band, I removed the balance weight in the nose and balancing is now achieved by sliding the battery forward and aft, hopefully it should give me longer flying times. Soldering that circuit board was tricky though, so dang small I spent the entire time peering through a loupe. Flys beautifully now, now to attack the walls and ceilings again.