With the help and knowledge from BDH we managed to get a number of tasks completed this morning. I was not sure whether the aircraft was tracking straight when I was taxiing. BDH stood behind the aircraft as I taxied along the runway and observed it was tracking straight,which is a relief. We then checked the three propeller blade angles and they are all within .3 of a degree of each other. ( tolerance is a maximum of .5 of a degree ). With the expertise of BDH we then synchronised the carburettors. They were very close to correct, we only had to adjust one throttle cable adjuster nut by 1/4 of a turn. Thank you Des for the use of your " Carbmate " and your guidance and knowledge of how to sync. the carburettors.