Just written the words, but than I've got an idea.
Shimano uses for some brakepads (on rimbrakes) really small splines. 1mm or less. Usuall it's for the toprange parts like
DuraAce or something of the top v-brakes.
May it's possible to drill small holes in the caps (and matching holes) in the wipers. Than you can carefully secure the
caps.
René
