"Most" Linn owners use a mat and not a clamp. The reason is partly something that Bdgregory and Armstrod already mentioned: lightly suspended decks don't like extra weight and moving mass. If you do add a clamp you might have to retune the suspension, though the Michell is pretty light, as they said.
Another reason is that clamps and mats are inherently counter-productive. Clamps are designed to couple a record tightly TO the platter. Mats are designed to de-couple a record FROM the platter. Either method could sound best on a particular table, but trying to do both simultaneously seems problematic.
YMMV of course. I could be all wet since this is all theoretical. I don't own a Linn either.
Another reason is that clamps and mats are inherently counter-productive. Clamps are designed to couple a record tightly TO the platter. Mats are designed to de-couple a record FROM the platter. Either method could sound best on a particular table, but trying to do both simultaneously seems problematic.
YMMV of course. I could be all wet since this is all theoretical. I don't own a Linn either.