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Actually no, and with the weight of the laser I think you would end up putting too much force on the bottom back of the carriage and snap. The 3 screws in the piezo plate are necessary to make the whole assembly rigid. In designing the assembly I did some unscientific testing of materials and weight to see how much for it would take before breaking and this point was always the weakest.

As for tensioning the piezo, I played around with this a bit. I thighten the screws evenly until I feel a sudden increase in resistance and stop. The tool mount should not be loose, but not so tight that it cannot compress the piezo disc any further. This should result in a small amount of pressure be pre-loaded onto the disc. In my unscientific tests (I tried a few setups) it gave sensitive and repeatable results.

The being said the screws at the bottom which act as a hinge are very tight on my setup. In all tests that I did the tension of these screws was unimportant because the tool mount itself always responded to pressure on the nozzle and was readable by the disc. I tighten these screws so that they are tight and the mount is rigidly held in place.