I purchased this jig reluctantly on Amazon, due in large part to it’s high cost. I bounced the idea around overnight, and the accuracy of our door pulls outweighed my frugality. One small detail though… the edge stop needed to be flipped 180 degrees. The knob wouldn’t allow it. 
This was a simple fix, but one that needed a vise to do accurately. Our garage is such a wreck that my vise is buried behind a weight set and treadmill.
Knob die ground down.
I covered the edges with painters tape, I didn’t take the time to polish my work up. I wanted to get this job finished! Here you can see the need for the adjustment to get the door knobs perfectly aligned.
Clean.
All in all we had 42 knobs and 22 pulls to install, and this jig made quick and accurate work. I am happy to have bought it for this project.