Thanks Warren. I really appreciate both Brian's and your advice and will gently exercise the drums as suggested
I would much rather get the original scope repaired - even if I have to sentdit you in Canada. If that is not possible and you can help put me in touch with someone nearer home, that would be very much appreciated.
My interest in the repro's is only to try to cover all eventualities and my hesitance in rushing down this route in not snobbery, just I've not read anything that indicates them (as yet) being a satisfacrory or guaranteed solution (focus issues, problems holding zero/weak springs, overall build quality etc)