How to use an engraver on stripped screw?

Hi all,

I have started to attempt to repair things as a hobby and strip some screws from time to time.

Unfortunately one screw has stripped completely on a pair of beats I was working on I tried the rubber band and glue method to no avail.

I am awaiting a delivery of an engraver as I read on here some people have had success with these.

Does anyone have any experience with using an engraver to fix a stripped screw how did it go?

Any videos to share of one being used?

Thanks