Thanks Guys,
Terra Scorcher, hadn't heard of that, had me baffled, didn't realise there were so many variations on the three/four shock theme with and without turnbuckles and the anti-roll bars. Good to know I should be able to get the bits easliy. It was in the garage for 15 years, didn't think I'd be in luck.
I've downloaded the Thundershot manual and now know which bits I need, how does the battery stay in? Looks like one end of the battery holders pivot on a screw, but it's not clear what keeps the other end in place.
DCC