I have a k&m but the shaft that goes into the drill chuck unscrewed itself from the rest of the unit leaving a case holder jammed in it. I have an early sinclair with the three grubs screws holding the the lee autoprime shelholder in place. Either the grub screws work loose or the case if it sticks on the turner mandrel spins in the holder and it countersinks the primer hole. There has to be a better way? I see harts sell one but it is pricey what else is out there?