I have a 1985 house with a no-visible-brand faucet in a very inaccessible space (I’d love to bust it out and replace everything, but that’s beyond my time and money budget right now, and possibly beyond my expertise; I’ve been quoted at four figures due to the inaccessibility of the space, against an exterior wall in a tight corner).
The thing that you pull up to make the shower go — I’ll call it the diverter pin — corroded through, so the wider bottom part snapped off like a metal ball, leaving the rest of the pin free to pull out without pulling the body of the diverter up to block the water flow.
Is there a reasonable way to repair or replace this? I’m not sure how the pin goes in when it’s installed normally, is it just pushed in from the top with the plastic diverter body flexing to let the thick part through? In that case a similar pin could replace it, or I could marine epoxy it together. (I tried epoxying it together in situ, but that was too hard to apply and keep steady unsurprisingly.)