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End Cones for torsion springs

End Cones for torsion springs

End Cones for torsion springs

(OP)
I'm currently working on finding a stronger and tougher end cone for torsion springs.  Presently my design is using the overhead door standard of a cast aluminum part.  These are about the best parts for the cost, but it seems they have a tendency to crack in our application.  Is there a stronger and/or tougher design on the market for winding a torsion spring?  More specifically I would need a part that fits a 2.0-in torsion spring and can work with loads as high as 55 to 60 ft-lbs torque.

If you have any leads please let me know.

Thank you,

Cooperjer
Mechanical Engineer

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