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If you have a long driver bit, you can put it directly in your drill, which holds it firmer to get a centred point.
Using a laptop is not ideal as there are issues with power saving and parallel ports. Mach 3 takes over the control of the port to keep correct timings and power saving can mess this up. Just use a normal PC. I use a card for the LPT and it is fine, once you get the driver correctly installed.
Would you feel the same about the mosquitos that carry Ziko ?