In hindsight buying Jeremy's HP2 may have been cheaper in the long ron ;-)
Ive got 2 Airhead specials and a HP2

The HP2 is like a Airhead on steroids and i love it
If you send the gearbox to me i will strip it and rebulid it for a small charge...I have all the tools and have done a few
As for the steering lock some Gletter triple clamps to sort that out
was the tyres