I added press fit grease nipples. I found these at McMaster-Carr
https://www.mcmaster.com/1102k53 you drill a 3/16 hole, I used an end mill rather than a drill, so it cuts through the outer tube, but not through the inner tube, and these have a little barb tip that is a press fit with a hammer (use a socket as a driver tool). They seated well, though in retrospect, I should have added some loctite to be sure.
When I started pumping grease in, it was green grease, but it came out brown from all the rust in it. So I pumped a little more till I started seeing green come out. Seems to have worked.
While I was at it, I found a source of traction tread.
https://www.mcmaster.com/6979t11. I wrapped it on a small propane tank to curve it, then cut out pieces that matched the pedals and welded them on the edges. Other than making it painful to drive in bare feet, these ought to be excellent anti-skid and I don't need to add the rubber pads on the pedals. The rubber pads not only wear out, but they are slightly wider than the pedals, and I want all the room between the pedals that I can get. Welds are not pretty, but I was doing it while holding my breath, as this was galvanized stuff, and you don't want to be breathing zinc fumes.