I want to convert the #10 discontinuous rod rigging (double spreader config) of my 1978 Crown 34 to 9mm continuous Dux, as I do not know it's age and have already had a turnbuckle screw fail. However, my understanding is that Dux is rather slippery. My spreaders are all attached to the mast by two small brackets, fore and aft, which do not limit up and down movement significantly, so I am afraid the spreaders will walk up or down.
To further complicate things, the end of the lower spreaders are built for the "cups" of rod rigging, like this:
Take out the "cup" and you have a nice ring not suited for continuous rigging at all. I have a rough design for an aluminum puck sized to fit in the ring which can "squeeze" down on the Dux. But that assumes that squeezing is the right way to hold on to Dux.
Therefore: What is the best way to attach spreader tips to the Dux to keep the spreaders from walking up or down?