Thanks Pendragon - the assault on black reach dread is an unlovable lump of static. I thought it would be the best start to project dreadnought but in fact it has been a much more complicated conversion than either of the ones from the venerable / ironclad kits. I'm pleased I managed to get that much motion into the thing.
I mentioned previously that I'd run into the problem of the venerable and black reach dreds having different sized arm lugs, I found this solution" [url]http://paintpotprocrastinator.blogspot.co.uk/2010/07/dreadnought-arm-modification.html[/url]
used it on the dccw arm above and, perfect - held by friction. I added a magnet behind the 'plate' or cover to grip onto the metal spacer.