Problem using fasteners through multiple solids.

Hi,

I'm using Creo Simulate 3.0 and I'm having trouble using fasteners through more than 2 solids.

Creo keeps saying my model isn't constrained enough even after putting grounded springs of infinitely small values to try to trick him. Has anybody used Creo fasteners in a similar case ?

Thanks in advance.

Kevin L.

EDIT: Finaly got it working by placing two simple springs of infinitely small stiffness between each pair of solids.