I've never seen those, but it looks OK to me. If you think about it, the portion of the more traditional six sided file used on chisel chain is pretty much the same as what's in play with these triangular ones..
Old timer advice...
Only sharpen square chisel tooth in the very best of light, at the very best comfortable bench height. Keep the chain really tight on the bar, just barely able to move it by hand. Stabilize each tooth with gloved finger pressure so side to side movement is eliminated as...
Wow...I was all set to order up a couple, but $200 is more than I can justify, by a good bit. Too bad, I was really looking forward to this being available.
I have pretty fair success, IF the chain is in need of a slight dressing. If I've rocked it enough to ugly up the 4 factory angles then I am lost, wandering in the wilderness.
In other words, I think it's about impossible to hand file a square grind chisel point saw chain if you don't have the...
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