I bought a chipper from Bob at http://www.ruangsangthai.com/ in Burriram. I know Ruangsangthai does servicing but it is a big bugger to get in my truck. I thought I would sharpen the blades myself. Big mistake! The tires had rotted in less than a year, so I replaced them with solid rubber ones at the same time. To access the cutting blades I basically had to take chipper apart, including take off the air filter to access the last hidden screw. Blades are off and as I don't have a vice I want somebody else to sharpen them. Any suggestion where? Have asked the family, they have no idea.