The base units for the Vernier Dynamics System tracks attach by sliding a nut into the slot on the underside of the track. Some units were shipped with nuts that were a little too thick to slide easily into the slot. This is due to a manufacturing variation in the nut thickness.

If this happens, Vernier will ship replacement nuts.

VDS tracks shipped after October 2007 should not have this problem.

What are the dimensions for the different slots on a Vernier dynamics track?