my knee ascender is just an 18" webbing sling, some surgical tube, a few snaps and a hand ascender, works pretty well, and I have a hand ascender if I need it
I gotta grab some pferd files, I just use the stihl ones, they work pretty well
for anyone new to filing, get a file handle, its like $3 and stops the end of the file digging into your hand
properly sharpened chain is HUGE
id look at cuts on the trails, but the only trails I go to are on my property, with saws shapened either by me or my dad
my point still stands, figure out what works for you, your chain, bar, powerhead, wood, technique, there isnt a perfect way to sharpen...
ive seen it, only works with their specific chain, and I dont think itll last very long
tbh a hand file isnt much slower, and will give you more control over tooth profile
cool idea tho