In reply to angels:
Ah, the PCS with the mesh. That might be more difficult. Seems you were not the only one with the same problem, probably why they changed the design on the Flash and newer models
https://www.ukclimbing.com/forums/gear/jetboil_replacement_gauze__mesh_any_...
For what it's worth, I just had a look at the burner head of the old FireMaple stove I have in the closet (never much used it or liked it), and it might not help you. The whole tube with the burner head and air intakes is just screwed on a brass nut with the gas jet orifice on the plastic base and comes right out with a few twists. Whereas I think at least the Flash and perhaps the PCS as well used a bayonet system to attach the burner head and intake tube to the plastic base. Thus a simple burner head and tube replacement from the FireMaple copy might not be possible.
Jetboil still sells a whole burner and plastic base assembly as a spare part for the Flash, that might be compatible with the PCS, although at 35$ or more for something that could be helped with just a simple mesh...
Replacing the mesh with just a "similar looking" one might as well screw up the combustion or flame spread. Tough luck
Post edited at 17:40