Seems there is still a problem with warped Funk Achromats - just received a 5mm version for my SL1200G and warped so only contacting the platter around the inner part of the mat. The mat was shipped in a cardboard sleeve, though this looks like a manufacturing issue rather than shipping.
Very frustrating because I had a 5mm Achromat with the machined lip for my previous 1200GR that was perfectly flat - I sold that with the table thinking it would be better to have the non-lipped version for the flat 1200G platter.😠
I’ve placed the new Achromat under a stack of LP’s to see if it will flatten, but not confident.
BTW, my order was delayed from my dealer as the distributor was waiting on a shipment from the UK - so I expect this is a recently manufactured version.