SawTroll
Information Collector
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I was filing on spare guide bars, clamped in a bench vise. While this worked for newer chains with tighter links, links on older, worn, 'stretched' chains moved about quite a bit between the mounting slots on the bottom of the Fast Filer. This would probably not be a problem if the chains were tensioned on a guide bar mounted on a saw.
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The problem will be reduced, but there is no doubt it still will be a problem. This isn't the only guide that suffers from that problem though - all I know of does, when the chain is filed on a chainsaw bar.
An observation from the initial videos; It looks (and sounds) like the demo person let the file scrape on the cutters on the back stroke - witch creates serious doubts about how knowledgeable he is about chain filing.