This may be a dumb question but I'll ask it anyway. My old 028 AV's air filter has lost most of it's flock. The part number is 1118 120 1610. I can't find a OEM and the after market ones with the same part number show two screws. Mine has just one screw and it's on the right and the center is open so that the air filer box cover screw goes through it and to the carburetor mounting stud. Question. Will the after market filters work if the center screw is removed?