An old whetstone wheel gizmo.

[Larryjk]

Fond memories of helping my father sharpen the sickle bar for hay mowers. He did the sharpening and my job was to hold the long end to make it easier for him to keep it balanced. Always seemed like we had done a good afternoon's work when we did two or three sickle bars.

[Hoyt]

My Grandaddy had one on his farm that was built kinda like a tripod. Had bout a 20" grindstone and was hand cranked.