i been bitchin bout my chain file up last few months,,, i suspected was cuzz i had carlton brand chain switched and with hand filing the file would stick or shuddered in the slot very weird not a clean run just jar jar and then the edge was crap... I swapped chain weeks back put on stihl and well same thing again using OEM stihl and these swizz Vallorbe files makes no change,,, im gonna swap files brands and chain to test or remedy as its pissing me off i used to like filing up a chain very medative peaceful break in the work not now tho,,,, sumthin changed and its not my hand job method