I am working on my 90s Raleigh mtb (it's awesome), where one of the pedal dust caps was lost. Subsequently, the pedal without one had much more sand inside, and is in worse shape overall. As I'm finishing maintenance, I want to fix this, so, do you have any suggestions on the substitutes? My first instinct was to try a spare bar end cap, but it's much larger in diameter. Maybe I can use something small, and add a lot of plumber's tape to make it fit, but I can't think of anything right now.
Somewhere on forums people suggest coins or just no caps at all, but it doesn't sound right to me. I'll leave coins as last resort though.