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How about using a limit switch where your hyd valve is shown in your sketch and a solonoid valve to dump the pressure? The valve could be right on the tank and save some pluming.Rich
Looks like you've drawn a thumbscrew on the stop making it adjustable. You should be able to move it, make a mark and go back to each mark when needed. If you check your bends with a protractor, make and keep a chart for each type of tube, thickness, and springback you should be able to make it repeatable.
Real bummer BalOO. How in the hell did that ram bend like that? Did it bend just as you were starting a bend or at the end of a bend? Like the ram got in a bind or somthing?