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Looking at the hinges on my piano I can see that all the screw slots are aligned horizontally. If I was to screw a piano hinge onto anything the slots would be all over the place.

So what is the trick for getting them aligned?

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    Just for reference, this is known as "clocking" your screws. Feb 18 '20 at 17:42
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    Yup. For woodworkers, it's all variations of "turn the screw out and redrive". Before redriving some folks machine the underside of the screw or countersink the hinge bore a little. It's fussy work. There are lots of articles about this on the web, so feel free to self-answer if you want to make a canonical "clocking" answer.
    – jdv
    Feb 18 '20 at 17:49
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    This is often referred to as "clocking" screws. It's something that some woodworkers think is very important and others aren't concerned with. There are various tips to get the slots aligned (the main one being aligning the slots the same as you start), but aiming for clocked screws comes with some potential problems. If you try it you'll soon (almost immediately!) find that it can mean that some screws aren't fully home but they can't be turned a further 180°. It's a pickle. These days with flathead screws being so much less common any need for this has reduced considerably!
    – Graphus
    Feb 18 '20 at 17:52
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    @jdv, better still use torx and nobody can see if they're aligned or not ^_^
    – Graphus
    Feb 19 '20 at 7:50
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    @Graphus counter-sink all screw-heads and patch the hole with bookmatched plugs. I'll stop now.
    – jdv
    Feb 19 '20 at 16:26

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