Yes your right hidden under alloy cap is a nut which I undid and removed to little effect
I can move selector in full normal arc and rotate shafts but at no point does any slackness of selector arm occur I suppose I could remove layshaft bearing and 1st gear but they are very tight and to quote Roy "disengage selector and you should remove the cluster as a whole"
so I think I should persevere in 'disengagement' question is how?
I note the threaded portion of the spindle under the alloy cap where nut was rotates with the selector arm so should I tap on that with a soft drift or is there another hidden lock system?
Ive worked on Triumph,Vincent,Burman,Norton,Scott even Albion but this box this beats them all!