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Getting a broken screw out of mdf? Answered

Okay I have this problem with a screw being stuck. 
It's a small screw size, like maybe #10, but can't tell. It's stuck in 3/4 inch mdf, and it goes through the mdf. I've tried everything to get it out. Pliers don't work, and I absolutely CAN NOT drill out a larger hole. 
I tried super gluing a nut to it (yes, I know, stupid idea) didn't work.
Only other idea I have is possibly welding a nut onto it, but I have no access to any kind of welder. I can get a butane torch with interchangeable 'soldering' tips, but I think I could possibly do a cheap tack weld that way if it gets hot enough.
Other than that, does anyone have any ideas on what I can do? I'd like to preserve the threads as I will be using the same hole. 

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Vyger (author)2014-10-15

Vise grips. Clamp them to the stub, sideways and just twist them around. That is if there is a stub visible. If not cut a slot in it with a dremel

https://www.instructables.com/id/Dremel-fix-for-pro...

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rickharris (author)2014-10-14

If you use heat you will burn the MDF and perhaps spoil it.

Your best bet is drill a suitable size hole in the head and then:

use an easy out.

Use a left handed drill of a suitable size.

Force a length of rod in the hold and remove with pliers or similer

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user

It has no head, the head broke off.

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user

You can still drill down the shank.

In most case a second screw will just go down the side of the original and give a firm hold anyway if the head has sheared off.

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Burf (author)2014-10-14

Based on the criteria you've set, the only thing I can think of that will work is a "hollow screw extractor." The extractor will bore a dimensioned hole (1/4", 5/16" or 3/8") around the broken screw and grip the broken screw and extract it, ( the extractor is left handed.) You can then fill the hole with a dowel of the appropriate size.

I got my extractor set some years ago from Rockler hardware.

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xander.zoolander (author)Burf2014-10-14

I can't bore a hole out. I need to replace the broken screw (which it has no head) with a non-broken screw, and I'm afraid boring out the hole and plugging it with a dowel won't work because of vibrations.

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Burf (author)xander.zoolander2014-10-14

Then the only other way I can think of is to gently chip away the wood around the broken screw until enough is exposed to get a grip on it with long nose Vise Grip ( locking) pliers and back the screw out.

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