I just got done drill an existing cabinet. Always fun…
Tom
Oh yeah.
It was many years ago, but I got the supreme joy of drilling a bunch of them in about 25 lockers. They were only about 9" wide, which really increased the PITA factor, but the real kicker.......I'm the one who built them, in the first place! I called it out,
before they were assembled, and was told "No, they are not necessary." Less than 2 weeks, after they were installed, I got sent out to fix them. (This is probably at least part of why I hate installs, to this day) Many times, my participation in an install, seemed like a punishment. Every one of them was a negative experience.
This would not have helped, in that situation though, they were just too narrow.
I have had cases where someone wanted to add another shelf, in an existing unit. The one I specifically remember was a pair of large storage cabinets (like refrigerator size) They had 4 shelves and the customer wanted to go with 6 and have less vertical space on each one. They previously drilled hole pattern didn't extend far enough in either direction. Because of a "fixed" center partition, the LR32 rail wouldn't fit. I ended up doing it with a template, that had a couple of pins, which registered off of the existing row. It worked, but was hardly ideal. Sometimes there just isn't an elegant solution.