[Diabolical Artificer]

You can get something called engineers or marking blue which you paint on for marking out, though emulsion or tape does the job. Lawrence is right, a scriber or marking knife is the way to go for bang on accuracy. Have given up on pens, had too many holes in the wrong place. Using a sharp drill and pre drilling for bigger holes helps too. Oh and good light.

In the end it's the care you take on a job, time and patience are the key. Which is why a lot of my projects could be better as I'm usually in too much of a rush. Am getting better as I get older, though I'm still inclined to do five impossible things before breakfast.

Andy.