I have a different solution that has been recomended to me as professional home hobbiest. On Jameco Electronics - Electronic Components Distributor
there is a pro type tool and stand for carbide bits expecially designed for
PCB drilling. This company is good and has a good reputation with a lot of other quality parts and accessories. The whole set up is cheeper than your Proxxon 115/E I found on E-Bay. A idea to look into for you all. Kevin