[Amps] Mechanical question

[mike kendall]

Hello all,
    I recieved the cold plate (liquid cooling plate that attaches to the heat spreader) in for the linear project I'm working on.  It has 1/8 inch copper tubing coming out of it for a couple inches and is designed to have more copper brake line soldered/brazed to it.  Is there a tool that I could use to expand out the brake line a little so it will slip over the other brake line and allow a good mechanical connection before soldering?
  73,
  Mike

 		
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