I should have taken a pic, but was hoping the stalk was working by the time i'd cleaned it right out and freed up the innards..
Na, the cancelling knob is still in situ, its the actual with plastic nub that it cancells against thats the issue. The stalk is rivetted together, so not easily re-assembe-able if you drill it out, but theres a white triangular sliding plate that does the cancelling. When the wheel is turned, this christmas tree shape is pushed in, and it then presses sideways against the indicator holding springs, returning it into a home position. With the plate warn, it doesnt have enough throw against the springs. Theres also some slide pins on mine that guide this plate, and these have their straight slots now worn out, again not moving correctly. I'll revist it once its driving and been tested.
Im glad about the brackets, much betetr than I would have made.