Removing screws with ruined screw heads or no head

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Couldn't get grips on these rusted screwheads, so I used these universal things (in picture). Just sitting there drilling in for ages then put drill in reverse for a bit. They came out eventually but might just have been the vibrations. Tried different sizes too How do people remove screws when head's totally gone?
 
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BTW, you used the extactors incorrectly. Not that they're much cop used correctly.
 
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I see.....its the inside of a wet vac.
I think I would have ground off those screws and fitted new nuts and bolts, but no matter it’s done now.
John :)
 
I've got screws out with worse heads than them simply by using the correct screwdriver.
For future reference, @Keit, you are supposed to use a twist drill to drill a hole into the head of the screw/bolt that you want to remove before using the extractors anti-clockwise.
 
When you say twist drill bit, do u mean what's in the image? I thought these were called metal bits!
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I see.....its the inside of a wet vac.
I think I would have ground off those screws and fitted new nuts and bolts, but no matter it’s done now.
John :)
Maybe used metal blade on reciprocating saw or angle grinder
 
I've got screws out with worse heads than them simply by using the correct screwdriver.
For future reference, @Keit, you are supposed to use a twist drill to drill a hole into the head of the screw/bolt that you want to remove before using the extractors anti-clockwise.

They look similar to the ones I've got, you use the other end of the bit (not the spiralled end) to cut a suitable hole for the spiralled end, you do this with the drill in reverse, slow speed medium pressure.
 
When you say twist drill bit, do u mean what's in the image? I thought these were called metal bits!View attachment 211909

Yes, they are called twist drills or HSS Twist Drills, but not those cheap things. £6.99 for 13 different sized drills is far to cheap to be decent quality. They may get you through timber a number of times but once you start using them on any type of steel, even mild steel, they will soon burn out and become blunt. You should by a decent set from a well known brand such as Bosch which are a better quality and will last longer.
 
They look similar to the ones I've got, you use the other end of the bit (not the spiralled end) to cut a suitable hole for the spiralled end, you do this with the drill in reverse, slow speed medium pressure.

Those ones in the picture appear to have a square shank to fit in a tap wrench.
 
They look similar to the ones I've got, you use the other end of the bit (not the spiralled end) to cut a suitable hole for the spiralled end, you do this with the drill in reverse, slow speed medium pressure.
Drill put hole so the extractor fits tightly then put in reverse I guess
 

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