Thanks,Trevor, for your reply. I need the mechanism at the mast which turns the boom to set it winding up the sail.
Fortunately, Ian Pollard has volunteered a spare, which he reckons, though needing some repair, will probably do the job.
Thanks for your concern.
The C.Victor is now ticking over well, apparently lined up accurately. Cooling the exhaust is now my main challenge. If necessary, I shall take to the water with an outboard Regards David