Oh, well then! (I hadn't checked the part number or anything..)
Why is the mechanical noise a problem? Can it be ignored? Turned into a feature? (I personally love the sound of an oscilloscope or calibrator clicking away, but I don't know what kind of stuff you're working with.) Isolated, damped?
Examples might include routing a "U" in the PCB, around the relay, to provide some springiness away from the main board, then damping that with some foam rubber pads; and further damping the rest of the board with more of the same, or using rubber isolation washers around the screws/standoffs (give or take grounding requirements and such), etc. Steel or plastic covers, with acoustic damping, could provide additional attenuation.
Tim