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Help with screw extraction

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Help with screw extraction

Old 03-29-15, 04:07 PM
  #1  
Martian63
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Help with screw extraction

I changed the battery in my duotrap sensor today. Some how in the process when reinstalling I rounded out the 2.5 allen head screw. Now needing to remove again and put a decent battery in (I think the cheap ass battery I got from Dollar General is not worth a crap). The screw head recesses into the plastic cover for the sensor. Scared to bang on it too much. Any suggestions for removing that screw? Would appreciate any help. Will not be buying anymore cheap ass batteries from Dollar General.
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Old 03-29-15, 04:15 PM
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is there enough head showing to grip it with a pair multi grip pliers or something?

edit:- The screw head recesses into the plastic cover for the sensor.

never mind


but

do you have a set of screw extractor tools, that might do it
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Old 03-29-15, 04:51 PM
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do you have a set of screw extractor tools, that might do it[/QUOTE]

I don't know if they make an extractor that small. Will definitely be looking tomorrow.
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Old 03-29-15, 06:00 PM
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You could use Krazy-type adhesive or JB Weld to glue a sacrificial hex driver in the rounded-out head and extract it that way. Or find a fractional-sized driver or small Torx that is a tight fit; chamfering the edges of an oversized driver and tapping it into the worn recess might also work. You just need to get it to move one time.
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Old 03-29-15, 07:22 PM
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Originally Posted by dsbrantjr View Post
You could use Krazy-type adhesive or JB Weld to glue a sacrificial hex driver in the rounded-out head and extract it that way.
If you Krazy glue an allen key into the recess, you can get both the bolt and allen key back by dissolving the glue in acetone (or finger nail polish remover which is mostly acetone). In the future use a good quality, unworn allen key. Small ones loose their sharp edges rather quickly with use and should be replaced rather often.

As dsbrantjr recommended, a tight fitting SAE hex (try a 7/64") or a snug torx (start with a T10) may work.
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Old 03-29-15, 07:32 PM
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You can "sharpen" an Allen wrench by lightly grinding the end of the wrench. Never grind the sides; only the end. Be sure the bolt cavity is clear and the wrench is fully seated as you may only get one shot at removal.
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Old 03-29-15, 07:40 PM
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I misunderstood the question. I was going to say: Just tell her your getting back together with an old girlfriend.... that should extract you from her.

But since it's a rounded alien.... put a rubber band or kids balloon over the proper size alien.
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Old 03-29-15, 07:42 PM
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Adding a drop of Drive-Grip Vibra-Tite DriveGrip - Vibra-Tite may give enough "bite" to remove the fastener, without the hassle of my glue suggestion.

+100 on using a sharp tool.
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Old 03-29-15, 07:53 PM
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Originally Posted by Dave Cutter View Post
But since it's a rounded alien....


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Old 03-30-15, 08:51 AM
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Try using a Dremel blade to make a horizonal cut in the head of the screw and use a thin blad screwdriver to back out the screw.
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Old 03-30-15, 09:49 AM
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I've had good luck on small screws with using a left hand drill bit. The friction of the drill bit will unwind the screw enough to get pliers on it.
You can take a small, normal drill bit and re-grind the edge to make it a left hand, reverse drill bit. The flutes are the wrong way so you can't drill a deep hole but for something like this the cutting edge is all that matters.
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Old 03-30-15, 10:06 AM
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My first shot with allens is to try a brand new allen key. The good news is you'll be surprised at how often that works. The bad news is, after you get the old screw out, you should throw away both the worn allen wrench and the rounded out bolt.
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Old 03-30-15, 01:45 PM
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You can grind down your rounded off allen key to restore it. It will obviously shorten it a tad but will bring it back to new.
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Old 03-30-15, 02:52 PM
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Originally Posted by Dave Cutter View Post
I misunderstood the question. I was going to say: Just tell her your getting back together with an old girlfriend.... that should extract you from her.

But since it's a rounded alien.... put a rubber band or kids balloon over the proper size alien.
+1 A hack you might try is to stretch a rubber band over the end of the allen wrench and give it a try. The rubber band will fill the gaps and might give you a good enough grip to remove the screw.
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Old 03-31-15, 10:23 AM
  #15  
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Thanks all! Got it!
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