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Ed,
It was sort of an amateur (and anxiety driven) approach.
The fact is that I printed that sheet on my work's laser printer (on a Friday) and didn't know then if the toner would even stick to the buttons.
I didn't think then of adding any cross-hairs or other alignment aids.
I took the sheet home on the weekend and first trials worked so well and transferred so effortlessly that I kept going and found a way to align the labels I had at hand.
Sure enough, it took me some trials and some failed batches, but I wouldn't stand waiting another week to try again.
I think that printing a rectangle border of the size of the buttons would help to cut 4 flaps that would fold and match edge-with-edge, creating a small hollow box that could be put together with adhesive tape, and the button would just drop in.
It would certainly improve the process.

Rgrds,

Fabio