lf l had a Silvey grinder l would buy stihl square but hand filing l prefer somthing softer. I ran my handfile oregon cl .404 yesterday and it was more of a treat than the norm as l don't like the hard work at the end of the day handfiling. Usually 10-20 mins gets ALL my semi chisel chains sharp that l swapped out during the day. l actually now laugh when l remeber hand filing all my work chains at night after work....some days it would take ages with a couple of rocked ones in the mix. Then l was given a china copy oregon 511ax and life is good! Good to see ya found a good square chain source Mike, also Randy at weedeaterman is good for square chain.