sharpening hair clippers 

Alger

when the top blade is attached the screws pass though the underneath blade

@@jeremycreates no sir . I saw it clearly No screws were passing through it.

​@ravireddyism no screws pass through... this is done for ventilation and cooling supposedly.

This is totally incorrect. You must not follow this advice I'm sorry. First off when you sharpen a set of blades you sharpen them both to assure proper seating of the blades together. That is why they're sold as a set. They're sharpened on the same plate, preferably a plate with almost a flat drop unlike the blades that are detachable known as A5 blades that require a definite hollow grind. Adjustable clipper blades like these are done on a flat plate... which still has a small hollow grind or they won't cut. After sharpening you must clean all debris off and blast all residue off with a compressor... you then check the blades for proper grinding, reassemble, and oil... so much bad info on RU-vid its crazy .

there is a small amount of oil on it it douse not have to be oil but the fluid helps the dust be removed from the stone and stops scratches on both the stand and the item being sharpened

@@jeremycreates can you pour water in the stone instead of oil

yes but I have never tried it if you are searching on RU-vid you will also encounter window cleaner being used again I have not tried this, some people will also use wet and dry paper on a piece glass instead of a stone this will be maintained flatter in the long run but again I have not tried that

@@jeremycreates okay

Hi thank you for the information As i do not use them that often i have not sharpened them that often so am yet to experience a problem

Josh, what do you use instead of a flat stone, sanding paper?

The blade doesn't have to be concaved. It can be sharpened perfectly flat, but cannot not be convexed. The slight concave from the factory is due to it was sharpened on a sanding wheel.

@@Mukdeni I have to disagree. Now having sharpened a couple flat, they do not cut well and had to be replaced.

@@JmanRx81 sharpening clipper blades is hard. I have ruined a couple of them and yet succeeded. But I think that's because it's impossible to debur the back

Yes a little oil helps to carry away the dust that is created when rubbing the surfaces together, and a very small amount between the blades when reassembling the clippers also helps smooth operation