"geraldthehamster" wrote in message
...
I need to drill accurately some holes for taps in a 40mm thick beech
worktop.

How might I ensure that I am drilling exactly vertically, with my hand-
held drill?

I have one of these for drilling vertically accurately (Google "Drill
guide")

http://www.axminster.co.uk/pricing/I...uide-22269.htm

You may be able to pick one up at a DIY store or similar

HTH

John