Are you asking about the clamp type and the double flare "button" used for setting the length and performing the first operation?

Do you want to know how far to stick the tube out of the clamp? This may vary by manufacturer depending on little details like how much the clamp is countersunk.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-