I hope I'm not posting in the wrong place but you blokes here seem to have plenty of knowledge about these mowers.

I've recently been able to use one and it's a weapon. The problem though is when in self propelled mode I found myself jogging behind it and barely hanging on because it just travels too quickly.
After reading the manual I realize that it probably has the largest drive dogs attatched. To slow it down would it be simply a case of filing or grinding down the dogs to a smaller size?