I have the Mittler tools and have not seen cracking with 6061 T6. There are harder alloys like 2024 which might crack, but 2024 is for wing surfaces not bulkheads or interior panels. Aluminum will surely crack before Steel, & you do need to make sure your Belling Dies will work on aluminum.
Last edited by David Pozzi; 05-11-2017 at 09:43 AM.
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