I can uderstand Lefty wanting some pitch guages as I have wanted a set of Jonnell Guages for years to check my pitches or a set of Perfect Pitch guages as a second choice, but just couldn't justify spending that much money for no oftener than they would be used.
The reason I would have liked to have had my own is because of all the years I have been bowling which is approx 40+ off and on, "almost every" driller I ever had regardless of where I lived, when questioned about the pitch in a finger or thumb hole, gave the appearance that he didn't like being questioned. When I did question the driller anyhow, sometimes he was right and sometimes he was wrong. And I have had some drillers that were wrong when checking the pitch, would move the pitch guage slightly to make it look like it was right because they didn't want to admit they drilled the pitch wrong.
Since I don't like to fuss with drillers as most drillers I have ever had don't like being questioned about their work regardless of whether it is pitches or span or whatever, thus I always hated to ask the driller to check the hole knowing he wouldn't like being questioned. That is why I always would have liked to have had my own set of guages so I could check the holes myself and if off, it was easier for me to either take the ball back to him or take it to another driller to have fixed.
I am sure there are some of you that will say it wouldn't bother you to be questioned and I am sure it wouldn't, but as said above, I have always found more drillers that resented being questioned and shown they were wrong than those that didn't mind.
Whether that is Lefty's reason for wanting his own pitch guages or not, I don't know but that has been my own personal experience and I can't speak for others here.