On Thursday, May 1, 2014 12:12:52 PM UTC-4, Tim Wescott wrote:
Problem statement:



Mount a small (nominally 3.2 x 1.6mm) NdFeB magnet in an aluminum model

airplane spinner backplate (for a tachometer).


Maka a steel button slightly larger in dia than your magnet. Press the steel button into a hole and let the magnet field hold the magnet to the button.

While you are doing this make another steel button so that it weighs as much as the first steel button plus the magnet. Press fit this button in a hole to balance the weight of magnet, etc.

Dan