Have a duplicate thread on another Forum and some one posted this
I like old school ideas like this.
On bending tubes, my rollcage builder used to pack the tube full of dried silica sand , and plugged the ends with wooden tapered "corks" he'd then redden the whole bend but apply more heat to the outside of the radius, it was unbelievable to see the tube curl around Even as far as 90 degrees. Just make sure the sand is super dry though for safety reasons and packed tight by banging on the ground to force in as much sand as possible.
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Slowly tipping over the edge into madness
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