Forster Primer Tube Loader Aligns primers anvil-side up and mates with the Primer Feed Tube for quick loading in the Co-Ax Primer Seater. The Primer Tube Loader aligns all primers with just a few flicks of the wrist. With a little practice, you can go from the primer box, to Primer Tube Loader, to Primer Feed Tube in as little as eight seconds!