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    How to remove stubborn screws

    I am trying to remove the flipper to replace it but I can't undo the screw that hold the shaft, as seen in the pic.

    Click image for larger version

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    I have sprayed WD40 on it during the day but it still won't budge.
    I have also used a nail punch and hit it with a hammer, shock attack, no good.

    I have heard of the left hand drill extractor bit, do they work ?
    Any advice on how to remove them would be great.

    btw, this is on a Gottlieb System 1 playfield.

    #2
    Try heating them up. If you have a jet lighter try that


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      #3
      Can Play while not spilling the beer.

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        #4
        Tap in a torque bit...like T20 etc and then mini socket with your 1/4 drive [emoji106]

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          #5
          heat the surrounds and freeze spray the grub screw

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            #6
            Thanks guys, I'll try out a few of those ideas tomorrow.

            And, yes Wazza, I will be going to the Allen bolt as I have them on my JP & PP and they are easier to use. Not sure where to get them at the moment, will have to look them up.

            Also, not sure where to get freeze spray?

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              #7
              Originally posted by thejudge View Post
              Thanks guys, I'll try out a few of those ideas tomorrow.

              And, yes Wazza, I will be going to the Allen bolt as I have them on my JP & PP and they are easier to use. Not sure where to get them at the moment, will have to look them up.
              Edy knows, he has them.


              Sent from my iPhone using Tapatalk
              Can Play while not spilling the beer.

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                #8
                If you don't want to use a jet lighter flame you can try using a soldering iron on the grub screw, place it on the screw for 2 minutes per screw.

                I have used this method many times with good results.

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                  #9
                  I have an impact driver you can use. You will need a tip to suit, I can't guarantee I will have one, and one hit, she should be free.
                  Let me know if you want to try and I'll bring it over.

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                    #10
                    This stuff works well.
                    Click image for larger version

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                    Donkey Kong build - https://www.aussiearcade.com/showthr...-replica-build

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                      #11
                      Impact drivers are the go, just be careful not to destroy the bolt.


                      Sent from my iPhone using Tapatalk

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                        #12
                        Well, I pretty much tried every suggestion without result.
                        I even tried a left hand drill which broke.
                        I finally got a few out with an easy out bit, then I had to drill out the last one.

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                          #13
                          Any idea what size thread it is? Do you just get allen bolts from bunnings?

                          Sent from my GT-I9305T using Tapatalk

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                            #14
                            Can Play while not spilling the beer.

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                              #15
                              The parts manual says they should be #10-32 X 3/8 Hex Head Cup Point set screw.
                              So hopefully when I go to my local fasteners shop they will have them.
                              I think they will probably be imperial as well.

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