Hi, If the maker of the tank can get it to me (I'm mid way between Llanidloes and Machynlleth) then they are welcome to try it on my 500/4. Unfortunately the bike is immoblile in a big way as the shed it's in has it's access blocked by a lot of stone and as it's a sidecar it aint easy to move, also a non runner at preesent. I only have a bike licence anyway so cann't go and fetch a non runner down to the coast. But at only 30 - 35 miles From Aberystwyth the tank maker might be willing to come here (not ideal but if it's any help let me know and I'll pm you contact details)
Cheers
Matt