I received new daisy wheels to replace the 3 missing DWs on a mid 70's red MBH that I acquired. The small stopper tabs (?) that protrude upward into the bowl do not line up with the notches that are in the bowl holes, preventing me from fully closing the vents. Solutions? Grind them off? Also, anyone know where I can purchase appropriate sized black pushnuts? I can only find white at the local hardware stores. I need them for the MBH and an N code OTP. To purchase a set of 3 is fine online, until $7+ is added to the shipping.