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

[Robin Hewitt]

Therefore I reckon I need to have the gun drill bit turning & mount the guitar neck on a static table/bed

Not sure that works. You'd think all rotations were relative, but are they? :naughty:

If you spin the workpiece you define a line through it, the axis of rotation.

If you spin the drill you define squat.

If a turning drill goes off line, it's centre is still the slowest moving part of the cut.

If a stationary drill goes off line, it isn't.

Question is, is that how a long gun drill bit keeps itself on target?

They cut and burnish.