Over time plungers do tend to wear out from use and abuse. If you are overhauling your gearbox or experiencing difficulty shifting it is highly recommend to replace both of your gear selector plungers.
Plungers are made in England to replace both Triumph and BSA part number 40-3193, 57-2105 and T2105. Fits all BSA unit single models (C15, B40, B44, B25, C25, TR25W, B50, etc) from 1958-1973. Also fits various Triumph Cub models. Check your parts book to ensure the best fitment.