It is quite
easy to make light and robust wheels from Depron foam, 3mm or 6 mm
thick, depending on the size of your model. Punch tools of various
sizes can be made using plumbing coupling devices of various
diameters.
I am pretty
sure your next question will be : How do I find the center of these
bloody discs I have just cut ? No panic. Just cut a piece of
cardboard (wall calendar for instance) with an 45 ° angle and
tape it as shown below on a mechanical square. Isn't that easy ?
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