Hey all,
Just an update for the record:
We called Jason at White Bear Boat Works, which was (if I can put it gently) less than helpful. It seems the ethos/morale may have changed there in the last couple of years....
Rodger Martin was lovely to correspond with, but had little current info or contacts for hardware & fittings. On the whole, it seemed difficult to source used/spare parts for this need.
We eventually made our way to the customer service department at Harken, whose repair team was able to recommend a repair kit for the non-captive bearing-style windward sheeting traveler on the J18:
HSB501.
It includes fresh new end caps, ample torlon bearings (21 per side), with a slick bearing loader, and Loctite for the end cap screws. It was a smooth and fairly slick job (just a little fiddling getting nuts and washers off from under the deck, to free up the traveler rail, without losing them). Great, affordable repair kit if your traveler ever blows out the way ours did.
cheers,
Cameron