A Sharpening kit for a reel mower consists of a container of lapping compound which is an abrasive suspended in a sticky substance which can be applied with an accompanying brush. There is also a crank provided in the kit, and a set of instructions.
First lay the mower so that the cutter bar or bed knife is up and grinds against the blades just a little bit. By tweaking the pivot bolts on each side ( there are two of them on each side)the tension should be the same across all the blades.
Disconnect any wheel from the side and expose the cog wheel which is taken off too. Stand the reel blades upright and dab lapping compound on each blade with the brush provided.
Now with the crank handle provided, crank the reel over and over in reverse. This is called back lapping and it sharpens the blades. Put back the wheel and you are ready to go!