no penetration is the contact set type that you want. that allows components to separate and also interact (with friction if you add it).
the problem you may have is that it might fly off into space. you can help part of this by splitting it down the middle and restraining it in that direction. if you still have restraint problems, you may have to fix one point on the glass somewhere. the ideal restraints will be whatever type of restraint that your window cell actually provides. it may be necessary to add that point if you can't virtualize it with constraints or connectors.
this all assumes that you're going to fix the bottom face of the washer or something similar to hold everything in space. that would basically be like gluing it to an infinitely stiff table.