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Ever wonder just what a "mandrel" is, or what it means to tube bending? Wonder no more! Bill Hahn Jr cuts through the murk with a smirk, and does the work...right in front of your eyes. 4-12-22: The Ercolina Model 30 Mandrel Tube Bender in this video is now for sale! It includes tooling for 2.0, 2.25, 2.5 and 3.0 inch bending in 16 gauge, aluminum, steel and stainless steel. Contact Bill: sales@hahnracecraft.com for details.