For a while now the Trainstar has been grounded due to increasingly-bad prop vibration.
Initially I thought the front fuselage was flexing from fatigue and installed stiffeners, which made no difference. Then I got a prop balancer & did the prop which likewise had a nominal effect.
It turned out that it was just the bell mount grub screws which, although I'd tightened them, were a little loose as the hex drive had stripped. Fixing this was tricky and painful as I couldn't get the originals out, and I couldn't tap new holes for fresh grub screws as there wasn't enough depth.
Eventually it has been fixed, well enough anyway, and now the Trainstar is back in the air again, still full of character...
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