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Removing Sheared Off Screws grrrrr

jnash

By jnash
in Watch Repairs Help & Advice

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jnash Super WRT Addict

jnash

Posted
Posted

So i usually use Alum powder, however on of the screws have been sheared off  look to be within a steel boss so therefore worried it will eat the hub along with the screw.

unless i can replace the hub, i will have to resort to loosing up / heating ... drilling. 

 

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Marc Distinguished Member

Marc

Posted
Posted
8 minutes ago, Andyclient said:

Bergeon do a screw extractor tool no:30209 but whether it would work here or justify buying i don't know , maybe if someone has one you could borrow ?

The Bergeon 30209 is a useful piece of kit to have in your armoury but it has 2 significant limitations.

  1. It can only be used on through holes as it has to be in contact with both ends of the broken off screw. If the screw is in a blind hole it can't be used.
  2. At ~£76 plus postage it suffers from severe "Bergeonitis". It's an expensive piece of kit to have sitting in your draw on the off chance that you're faced with a situation that can't be addressed with alum.

I was lucky, I found mine at a car boot sale for less than £1 (for my £1 I picked up the 30209, a very nice canon pinion tightener, and something else I can't remember what) minus the runners. It took me all of about 5 mins to knock up a set of runners out of blue pivot steel on the lathe, and in 5 years I have only used it about 3 times; on that basis I could not have justified the cost of new. It is however a very simple concept and could make a very nice DIY project for someone with some basic kit. If pushed I reckon I could make a workable version from scratch using basic hand tools and perhaps a pillar drill.

@jnash I think that if that steel insert is blind drilled then you best option is probably to use a very sharp graver point to try and key into the top of the screw to turn it. So long as the bottom of the screw isn't jammed hard into the end of the blind hole, in other words if it sheared because underside of the head was hard against the top of the insert, and there is no corrosion causing the threads to bind, then you have a good chance of success. If however it is binding then hot/cold, penetrating fluid may be you're only option short of either drilling out the screw or even replacing the steel insert altogether.

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clockboy Distinguished Member

clockboy

Posted
Posted
1 hour ago, Marc said:

The Bergeon 30209 is a useful piece of kit to have in your armoury but it has 2 significant limitations.

  1. It can only be used on through holes as it has to be in contact with both ends of the broken off screw. If the screw is in a blind hole it can't be used.
  2. At ~£76 plus postage it suffers from severe "Bergeonitis". It's an expensive piece of kit to have sitting in your draw on the off chance that you're faced with a situation that can't be addressed with alum.

I was lucky, I found mine at a car boot sale for less than £1 (for my £1 I picked up the 30209, a very nice canon pinion tightener, and something else I can't remember what) minus the runners. It took me all of about 5 mins to knock up a set of runners out of blue pivot steel on the lathe, and in 5 years I have only used it about 3 times; on that basis I could not have justified the cost of new. It is however a very simple concept and could make a very nice DIY project for someone with some basic kit. If pushed I reckon I could make a workable version from scratch using basic hand tools and perhaps a pillar drill.

@jnash I think that if that steel insert is blind drilled then you best option is probably to use a very sharp graver point to try and key into the top of the screw to turn it. So long as the bottom of the screw isn't jammed hard into the end of the blind hole, in other words if it sheared because underside of the head was hard against the top of the insert, and there is no corrosion causing the threads to bind, then you have a good chance of success. If however it is binding then hot/cold, penetrating fluid may be you're only option short of either drilling out the screw or even replacing the steel insert altogether.

I agree Marc I have one (purchased new) & I have only used it twice in as many years. However it is handy.

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ricardopalamino Distinguished Member

ricardopalamino

Posted
Posted

I bought a set of these cheapies from Esslinger and believe it or not , I have used them about 4 or 5 times and have had success each time .

  Some screws came out easy , but some of them I used a bit of penetrating oil first , then put the watch plate in a bit of warm water in my  ultra sonic cleaner for a while to vibrate the part . 

 

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59ffae5206618_ScreenShot2017-11-05at2_28_52PM.png.e0c071009a1c506d888af8e3e269664d.png

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