We have a 5440 tank with the shear pin style sprockets on the transmision output shaft. Are these brass bushings suppose to be tight against the shaft? Pulled them off and they were all stuck tight to the shaft the bushing came out of the sprocket when i pulled. I thought they would have to be loose on the shaft for the bushing to roll on the shaft when the shear pin breaks or else its still going to turn the sprocket when the shear pins break. Maybe I’m wrong?...