I dug these guys to show kinda where I started with knives. Pad knife on top then carpet, linoleum and the new fangled razor blade. I believe we called it a flipit knife.. My folks had a flooring shop in a small town and in the early 60's when I was in grade school I was dads tool chaser in the summers. As time went on I was able to do more on installs and by mid hi school I could carpet a house start to finish. I referred to linoleum but in reality there wasn't much linoleum any more. It was the soft vinyl and inlays. But by gawd its still a linoleum knife. I didn't do much with the vinyl early on. Everything was carpet. Kitchen, bathroom, everything. It was the fad. I never saw the "flipit" knife till the late 70's. So you can imagine the amount of sharpening with those other two. Just a quick circular action on a small stone for the carpet and pad knives then back at it. On the linoleum you would use a long stone and for lack of a better way to describe it you would scrub the cutting edge back and forth. Then when you had a good edge you pulled the knife straight towards you on some scrap material with light to moderate pressure to be sure it tracked straight. If not you would work a little material off of the trailing edge of the tip, one side or the other, to get it to pull true. I got out of the flooring then went back at it several times. Eventually left it for good but no matter what vocation I would wander into there was always a need for something sharp. There have been those that have said I really shouldn't be allowed to be around sharp objects. Words like accident prone would be mentioned but I always figured if you leak a little then you will always be making some fresh.