Very nice tool for a noob / homeowner / DIy'er like me, with an old 16" Remoington Electric that has a totally rocked out ( from underground work cutting out many roots ) bumpered chain. I filed / Dremeled / Roto-tooled the material at the top of the bar guide slots flush with the surface that sits on the cutters and the tool works perfectly with tie strap bumpered Oregon 91VG chain. Took me an hour or two to figure out the tool, make the mod, and bring the chain back to "chip-rific" ship shape. I ripped through about 20 feet of arborvitaes ( 20 or 25 2 or 3" sticks ) at the back of my deck in about 20 or 30 minutes, touched up the chain in about 5 or 6 minutes using the Fast Filer and put everything away until next time.... Thanks to SawTroll for his input, as it led me to not worry so much about making the transition form Oregon's 30 deg top angle to the 35 deg's of the Archer jig. As I touch up the chain in the future, I'll eventually get it to the Archer / Fast Filer angle. Thanks to Philbert for all your input, I definitely feel like I've gone through chainsaw chain sharpening 101 thanks to you. And thanks to everyone else for their input, tips and tricks....