good luck finding a sprocket for a 20mm shaft that will track right!
volvo pentas have a 17mm shaft with a 12mm pump head... just a thought.
and they use basically the same pump as we have on our VW's
are we saying a 20mm shaft aint needed on a td? TDI sprockets would fit?
20mm shaft is nice if you are running a 14mm head. its my understanding that anything under a 12mm head will do fine on a 17mm shaft.