Thanks very much Dave, I'm going to give that a try. One thing I'm not quite clear about is where the halyard goes when it leaves the brass fitment at the top of the mast - does it go straight out to the existing triple block on the cabin and then back to a cleat, or are there any other fittings involved?
And on a totally unrelated subject, do you know where the second block on the topping lift is meant to attach to on the boom?
And on a totally unrelated subject, do you know where the second block on the topping lift is meant to attach to on the boom?