Hello all, I'd like the benefit of your collective experience in finding a turntable mat. Challengingly, it seems, I'm asking for something very out of the ordinary in this digital day-and-age in wanting that mat to be flat, rubber, and of moderate thickness. Wherever I look I see mats by the likes of Electrohome and Fluance, all claiming to be 'audiophile', but none truly flat and all having positive- and negative-relief areas (as if only some parts of the vinyl need to be supported during playback) in some silly nod to retro looks. Similarly, it's hard to find a rubber mat that's greater than 1.5-3 mm-thick. When I bought my STD back in 1980 such mats were ubiquitous -- now they're all made of felt, cork, pig-skin (!), wool (?!?), or brass (wtf?). Can anyone point me at a source for a heavy, flat, label-recessed half-cm or-more turntable mat made of rubber? N.B. As someone will doubtless 'reply' by asking why I want what I want, and if it needs to be stated, I would like the mat to damp vibration in my aluminium platter -- which wool/felt/whatever, etc. do not do.