Td, That's the first I have ever heard of a Boston Audio Mat being warped. Both my Mat1 and my Mat2 appear to the eye to be perfectly flat, and certainly there is no tell-tale sign of warpage when they are spinning. I trust your judgement, but be sure there is no other possible cause of your perception that yours is warped. If it IS warped, BA should take it back and exchange it for no cost, IMO.
One other thing: Why do you deem it to be so important to maintain the exact same thickness as the OEM rubber mat? A slight tweak of your VTA should take care of any minute difference between the BA and the OEM mats, and placing the rubber mat in between the BA and the bare platter will probably alter the sound, for good or ill.
Considering the materials of which they are made, I cannot imagine a BA mat warping post-manufacture. It could conceivably have been warped as a manufacture defect, I guess.
Chris, would love to know what you think of the two Mk3's, with vs without the Krebs' mods. (Of course, there are nothing but positive reports from other sources of which I am aware.)
One other thing: Why do you deem it to be so important to maintain the exact same thickness as the OEM rubber mat? A slight tweak of your VTA should take care of any minute difference between the BA and the OEM mats, and placing the rubber mat in between the BA and the bare platter will probably alter the sound, for good or ill.
Considering the materials of which they are made, I cannot imagine a BA mat warping post-manufacture. It could conceivably have been warped as a manufacture defect, I guess.
Chris, would love to know what you think of the two Mk3's, with vs without the Krebs' mods. (Of course, there are nothing but positive reports from other sources of which I am aware.)