That's one I'd not seen before but isn't the same shape as the red one on Jurgen's bike. Wonder what the tube part at the back of the clamp was for? Like what ELS stood for
Anyway not going with the AC device, although if I did find it I'd probably get it, just the Manitou chainstay one.
Hi Masha, thanks for the info. I've seen plenty of pics of it, not decent closeups though, and it doesn't look complicated. So worst comes to the worst I'll have a go at making one, fail and get someone who knows what they're doing to make one In which case I might need to pester you for decent pics and dimensions if that's OK.