a needle-nosed pliers with a bend in the middle (they're a commercial product) makes an adequate punch-down tool... would probably reach under the 2x4... but the pliers has a habit of shorting out adjacent rows.
I would require that the customer move the shelving out of the way and call me when it's been done. End of story.
-Hal
Ditto. I'm not breaking my back or doing any heroics to uncover their stupid.
That there is one of those new 33 blocks. ?