Well hot damn!
tl;dr: super expensive brake repaired after six years using bits from a super cheap brake.
My sparkly purple recumbent is still indisposed while I work out the best plan of action in replacing the fork. Woe is me. Tulyar's hand-me-down turned out to be too narrow and too short. A new disc fork, whether constructed by Kinetics or Mike Burrows or the man himself Tim Brummer, is a whole chunk of money. One option that I may well try is to go back to v-brakes, at least temporarily, if I can get a second-hand fork from another Lightning owner. I replumbed the bike for discs, you see, so recabling is non-trivial, but my time is free, and I need this bike.
Thing is, the bike itself was designed in the early 1980s when roadie caliper brakes were the thing, not cantis, and certainly not Vs. When I built the bike in 2007, I put the smokin' hot Avid SD Ultimate v-brake on the front, because all v-brakes have the cable going in from the top-right-hand side, but on a recumbent, that's where the chain is. The Ultimate, however, like the Paul Motolite, is swappable from right to left. The problem, and one of the reasons I went to discs in the first place, was the spindly plates inside the brake, that retain both the spring end and the pin that goes into the brake boss on the frame, had broken, leaving the brake useless. :-( Blame Avid for going all weight-weenie with aluminium when steel should have been used. You absolutely can't buy the Ultimate, even second-hand, anywhere these days.
Since I'd been studying the Paul brakes, yesterday I had the brainwave that since it was only the spring holders and tensioners that had broken, I could replace them entirely with those from another brake. Before I hacked apart a spare pair of Avid SD7s that I'd taken off my mountain bike yonks ago—and SD7s are still worth a bit of money—I decided to go to The Bike Station today to see if they had any really basic Avid or Shimano v-brakes that I could use to practice my cannibalism. An hour's rummaging turned up a pair of SD3s which were just the trick. Some rotter though has purloined the USE Shokpost I had my eye on last time.
Back home, I knocked the spring holders apart to get at the bushings. I didn't need the whole length since the Ultimate runs on its own ballbearings, so I mounted them in my big drill, and chopped them down with my faux-Dremel cutting disc. Worked like a charm. The fork may have ceased to be, but a test fit on the brake boss went well enough that I think I might just get away with going back to cables. I might even put the original wheels back in too, to avoid spoiling the brake tracks on the newer wheels.
Do I go back to discs later, when I'm feeling flush? We'll see.