Another small but good investment that is very handy for these kinds of jobs, is a set of Transfer Punches.
They're calibrated steel punches made specifically for transferring the centre of an existing hole to another piece of material (wood, steel etc). They're great for accurately marking screw holes in the heel of a neck from a body.
Again, I've just linked an Amazon page that shows them. You can get them lots of other places too.
Small investment, big benefit...
Transfer Punch Set
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