Homebrew PCBs

Hello Group

I have a quick question about precision drilling of home made PCBs.

Because of poor eyesight, I use a CCD microscope next to my Dremel
Model 300 drill press stand.  Although this set up is a big improvement
over doing thing solely 'by eye', there is a parallax error introduced
between the location of the retracted drill tip and where it eventually comes in contact with the PCB.  Once I saw a milling machine where one
was able to sight straight down into a bulls eye.  Is there a way to 
rig mirrors to do this?  

P.S. Sincle sided boards are no problem, as I can hold them up to
strong light and position a hand held rotary tool with good enough 
accuracy.  

Any suggestions would be appreciated.

Cheers

Chris