Tube bender input

[WAZZUXJ]

I've read that you can make sleeves
1 3/4x 120. Bend a 45 cut the tube in half then use it to sleeves the die to bend smaller tube inside it.

Though I've never tried it.

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I have done this with my 1.5" die. I made sleeves for the die and slide block using 1.5" x .120 tube to bend 1.25" x .120 wall tube. It works well.