Radiator Bleed Valves (Sandy)

Hi I recently had to fit a new radiator and bleed all of the others. No air was coming out at first and i completely unscrewed these (when i was pushing air through) It dawned on me if i had dropped one and lost it through a floorboard then the water came out id be in a mess. So wondered if anyone had any spare laying around or if your skipping old radiators if i could have the bleed screws out of them please.