1972 Ski-Doo Shop Manual, Page 27Get this manual
REAR HUB ,r
3Remove the nine (9) bolts and nuts at taching the mobile flange and sprocket to the rear hub4Apply liquid soap or petroleum jelly on sprocket bead and with two screwdrivers (round bars), pass the sprocket over flange and link plate (fig1-3-12)1-3-13