Thanks Guys - no mods then, just a new rubber mount. I assumed that the bracket that holds the rubber mount was further aft on the frame on an F1 (as tank is longer and no experience of F1). I'll order one from DS.
Incidentally, progressing well, just refurbed switches and new harness to go in next. Engine has had rebuild and standard exhaust are away with a friend to weld the holes (in the areas that don't show luckily) - I had these spare and to keep the cost of the build down, will be painting them black. Seen a few on tinternet and I think they can go well with the cafe racer thing - we'll see!When I get them back, I will use them as a template to re-weld the rear frame mounts (that hold the rear pegs/exhaust) back on - they had been cut off by a PO but came in the box of spares. Then only bits and bobs to finish with target next spring when I will sell it to fund the 500 standard build.
Have attached a pic of the progress so far
Thanks again