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  1. 23rd September 2015, 01:59 PM #1
    old_picker's Avatar
    old_picker
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    Default Advice please - oops


    Not quite sure what to do here - the screw is snapped off just below the surface - diamater is 2.7mm x 25mm long - too big for the stewmac doo hickie - blue tape marks the back of the bridge - is there a way to retrieve it or am I wasting my time ?

    Fitted quite a few of these bridges and never had this happen before - Had a test string up prior to finishing and on removing the bridge got 3 out out 4 you can see on the left protested but yielded in the end and 5 snapped off as soon as pressure applied. Screws seem to be smaller and softer than previously and I remember them going in pretty tight. The timber is myrtle and pretty hard and dense.
    ray c
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  3. 24th September 2015, 12:14 AM #2
    Pauls321
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    Default

    Hi there Old Picker. I think I would try and drill that screw out with another smaller drill bit. If you say its 2.7mm, use a centre punch to give the drill bit a centred starting point. Try a 2mm bit first, maybe you could go to 2.5mm. If you can get it drilling down inside the screw, the screw should just collapse and come out. With a drill press would be best.

    When I am pilot drilling for any screws I always go between .5 and 1mm less for my screw diameter.

    Good luck with it,

    Paul
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  4. 24th September 2015, 09:11 AM #3
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    Cliff Rogers
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    I've managed using that method before as well.
    Cliff.
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  5. 24th September 2015, 10:00 AM #4
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    Default the solution



    6.35mm [1/4"] od brass tube with some points filed into the bottom which makes a nice mini hole saw - or i guess plug cutter - when i got to depth the plug just broke off and pulled out screw and all. A neat trick that I had seen years ago somewhere on the interwebz but always discounted because I felt that putting that fine brass tube into the drill press chuck would undoubtedly distort the tube and throw it off center making it unusable. Necessity is the mother of invention so I thought if I wrapped a 25mm length of hardwood dowel in masking tape and forced it down the top of my improvised mini hole saw it would stabilise things a bit. Perfect - I chucked it in the drill press and it ran true enough. I slowly worked it through the tough figured myrtle taking heed to let it cool every 5 mm or so. I re sharpened it about halfway down. I was almost to depth and pulled up for a cooling spell and to my amazement I was left with a very neat 1/4" hole. I quickly filled it with a plug cut from a myrtle offcut. I had thought that I may have a lot of trouble prising that plug out of its hole but luckily not the case.

    Many thanks to those who have offered advice. For those of you who don't know me this is not the first guitar I have built and in fact I've built quite a few. I would have thought by now that I should have learnt to lubricate my screws EVERY time.
    ray c
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  6. 11th October 2015, 10:22 PM #5
    robyn2839
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    what about cutting a slot in the screw with a dremmell cutting disk.........bob
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  7. 12th October 2015, 09:03 AM #6
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    Quote Originally Posted by robyn2839 View Post
    what about cutting a slot in the screw with a dremmell cutting disk.........bob
    the head of the screw being under 3mm and no room on the face of the guitar to make a mess. the solution I posted above worked pretty good
    thanks for the suggestion
    ray c
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