Resharpening an Olfa rotary blade 

And how did it work?

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I would say it depends on how much "tuning" your blade might require. Let the nail file(or metal file) do the work, you shouldn't really have to push. Your intent is not to "remove metal", but simply to help true up the blade. There IS a point where you are best simply to replace the blade with a brand new one. This tutorial is simply a backup plan in case you don't have a spare fresh blade on hand.

@@stonephotogear408 I agree it depends - how much pressure you apply your medium for honing; or if necessary, sharpening. Perhaps using sharpening stones if you have a collection. (demand is high since covid)... even 400 900 1200 grit emery cloth Willingness to happily practice and blank your mind so you can consintrait. Train your sense hearing touch feel etc. Can be scary, work smart with all common safety gear , even have a buddy holding your beer and scorn you for trying. :):)

Not recommended to do this if you aren't comfortable with the potential risks involved.

No idea, this is simple to help straighten the cutting edge out a bit because it rolls over, becoming dull.

you have to feel it..! get a bright light and just place a strit edge agianst it get the feel with practice the skill comes. see my fav knife sharpening channel, (I am just a fan of great content) Top 5 Sharpening Basics - Sharp Like a Pro