When it stops -- you're done.
You are aligning the end of the tube with the holding/forming block to start right?
I thread the handle to have the die against the tube. Close the valve - pump the handle - when it stops - you should be done. Back off the valve - unthread the handle to back the die off - and put in step # 2 - and do it all over again. LOL
YOU MUST USE ANNEALED SS TUBING.... SS work hardens in nanoseconds... which is why - even though I use a very fine blade to cut the tubing... I re-anneal it with the disc grinder. This also serves the purpose of squaring up the tube end.
Your tube needs to be seamless - thin wall - annealed.
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