What causes the retarder / retainer / clutch / transfer spring tab to sheer off in a New Departure Model D Coaster Hub? I overhauled my ND Model D rear hub and found it had a broken spring. I bought a NOS spring and installed it. I tested the bike briefly and the brakes instantly failed to stop the bike. I took apart the hub and found the newly installed spring had also sheered off. How can I fix this problem so it doesn't sheer off again? How does the transfer spring work? Does it move or rotate? Thanks! Thanks!