Seems alot of saws come equipped with this chain now. In some of the farm stores around here it is all you can buy for replacement. I don't want to throw them away, as I want to get as much life out of them as I can before trashing. They do seem to cut acceptably for me when new. Any insights as to what works with those rakers once several sharpenings have gone by? There is a line on them, but have no idea what that means. Thanks all.