Replacement Power Spring for the UPM 45 pitching machine also known as the Blue Flame 45 and the Louisville Slugger Ultimate pitching machine. This is also the power spring for the Louisville Slugger Black Flame 55 pitching machine. Just the spring. The pitching machines will gradually throw slower over the season as the spring get tired. Springs should be replaced every year as they will wear out with use. This is the spring that powers the pitching machine.