For the record, there is a clamp from Deben that will put a weaver to weaver mount for the mini lamp.

I found out just after a mate had welded 2 cut down mounts together to achieve the same

My one was cheaper it has to be said (IIRC the original is about £27), but not finished etc.

Just got to get the buggers to sit still now...my patch is so wet it's like slopping about in cement and the world knows exactly where you are