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I think they are trying to sell sharpening equipment, but they seem to spend more time showing how to dull it. I can't see how it would work better than a file. It probably takes the rakers down with the teeth though. There might be something to be said for that. Not much as it isn't hard to do, but something.
http://www.youtube.com/watch?v=2idn4mnBIbQ&feature=related
Here's another one. I guess I must run my chain way to tight, Their's is very easy to wiggle around. But then again I'll just use my file and keep the chain tighter so it doesn't fly off and cut something I don't want cut.
leaddog
Waste of money IMO.Not meant for high production. Plus it only works with certain brands/models/sizes of saws. Takes a special bar/chain that costs you more.
Save your money & learn to file by hand,its not that difficult.Then get a grinder later if you choose.
Power Sharp . . . for some reason I cannot picture some of these professional looking woodcutters and arborists using a PowerSharp . . . not when it restricts you to a certain bar and chain.
BDS . . . from the flex and play this doesn't look all that practical . . . looks like someone's attempt to make a portable, hand-operated sharpener.