Its a straight shaft bull handle got the bearings out easy enough with out heat put a bolt just slightly larger than bearing hammered it in gently screwed it around then pulled on it of course it came out bearing stayed but was lifted off its seating position then got a long shaft dyna bolt that fitted in the bearing hole screwed it down till it was wedge inside of bearing and pulled it out , yes the teeth are 15 on the gear that comes in from the side on an angle and 20 teeth on the main pinion gear solid square drive but i cant find any after market ones that say they fit a fs 86 or an fs 106 which use the same head and gear but will keep on trying thanks for your help regards Damian