Since my layout uses foam sheets as a trackbed, there is a need to drill holes, often many of them, through the foam.
The drill used is made from a piece of metal tube. I use brass tube which does the job and is available in in a variety of appropriate diameters (eg. K&S). I use two main sizes:
- 6mm for track feeders and points (turnout) wiring.
- 12mm for mounting Servos in foam
- + 10mm for other odds and ends
You could use aluminium tube but it doesn’t hold its edge well. Steel tube would work well if you could get the size.