I recently installed a vessel sink as part of a DIY remodel project. The sink is a Decolav, with all the proper hardware. My question is whether one should expect the sink to be rigid - that is, not move during normal cleaning and wiping. I'm reluctant to crank down on the thing. It's disconcerting to have the thing rotate a bit, but one has a very big lever arm when wiping the rim.
Thanks in advance for sharing your wisdom.