First time to change my oil on '04 ST4S. I drain the oil, change the filter, then take off the cap (14mm allen size) and NO SCREEN MESH!! Dealer changed the oil at 600 mi, did he leave it out by mistake or is this bike supposed to have one? About an inch inside the "hole" where the mesh is supposed to be there is a black, flat plate that reduces the diameter of the opening to about 1/2", but no removable mesh. WhadoIdo? Thanks!!