Saw an Instructable about using a camera macro focus mount to make PCB drilling feed.
I don't 'do' PCB (printed circuit board) but, I do recondition CV carburettors from late 60's through mid 70's for Honda 250,350,360, 450 DOHC (had a hand in several of the 360's in bike build section)
Made this to make new emulsion tubes.
Almost all from scrap bit's and pieces although I had to buy the Dremel clone and the 90 degree welded aluminium (I still haven't learned to weld aluminium ) It's counter weighted rather than spring tension, gives more consistent feel when driling0.50mm holes through 8mm dia brass. melted down some old lead wheel weights to make counterweight sliding inside column. 'Table' was scrap from motorcycle crate
Used an old toothbrush handle as the operating handle