I bought brake levers meant for 31.8mm handlebars (namely Tektro RL721, meant for cyclocross) some weeks ago, meaning to use them for a bike build which has a 20-something millimeter bullhorn handlebar.
Naturally, I didn't notice the error until now, when I am actually building it.
It's too late to return them, and they're perfectly good brakes, so I was thinking to find a way to use them. Is it possible to pad/shim this difference in diameter safely/reliably?
If so, what kind of padding would be best to use? I assume something like a metal cylinder with a fitting inner/outer radius, but not sure what such things are usually used for and where to find one.