Hi, To simplify the explanation of my problem, imagine that I have in my hand a rectangular steel piece of 1.5mm thickness with a hole of 2mm diameter. In the other hand I have a small tubular steel piece 10mm length x 2mm diameter. I have to put this tubular piece into the rectangular piece, but I need it to hold very strongly. I know that steel is contracted with cold, is it possible to create the tubular piece with 2.1mm diameter, subject it to cold to reduce the diameter, insert it into the hole and heat it to return the piece to its original dimension? is this crazy?