Removing Pins from drivers on Tyco wheels



I have a set of drivers from a tyco 0-8-0 that I need to remove the drive arms from.  On two sets of drivers, the nut the the bolt  screws into are spinning when I turn the bolt.  Any ideas of how to stabilize the nut so I can remove the bolt? I thought of jambing an xacto knife blade between the nut and the plastic on the wheel but don't want to damage the wheel.


Any thoughts are appreciated!


Mark K