An other post got my attention on this. Any secret to installing the mesh type exhaust gaskets with out crushing them by mistake? I use the tapered type.
Work your way around the gasket getting the entire thing started. If you seat one side too much, it cocks and distorts and won't want to go in. If you force it, it will then start to delaminate/come apart and become loose mesh.
Once the entire thing is started, apply finger pressure moving around the gasket. It will walk in. Be careful not to get poked by the gasket material. Some people use a socket that is about the same size as the exhaust port to seat it fully but I have always just pushed them in with no problems.