Can I pick your brains? How would you solve this puzzle....

[HankMcSpank]

Yes, it is & yes I know - charlieplexing - must sort that out one day & sit down to implement it!

So, to sum up thus far...

1. Gun drill bits (thanks robin - didn't know they existed)

2. You think it's a tall order (me too)

.....but we sent blokes to the moon over 40 years ago ....before I contact NASA, any more ideas here re how to drill a straight/precise hole along a 450mm wood guitar neck using a 4mm bit? (or even how to make a 450mm drill bit snce nobody seems to make one - this is the only (cheap) option I've seen to date http://www.orbitalfasteners.co.uk/de...eter-9354.html ...trouble is, the drill bit @6mm is 2mm too wide)