name that brake?

[darksunday]

is it just me or are they missing a return-spring or two? I know the catis use a sprung straddle, but what did these use or is there an internal return-spring?

after taking them apart youre spot on, the return spring is definitely missing,
i'll end the auction and keep them for spare parts, i dont want to sell them mis-described,

if anyone has an old pair and wants the arms pm me,