Hi, Werner, I began using a thin (0.5mm) Herbie's "Donut" mat to use with 120g-150g vinyl since I've been buying heavier (180g-200g) vinyl and wanted an easy way to compensate for the difference in thickness. The mat is just about the right thickness to raise the thinner LPs up to a similar height as the heavy vinyl LPs. So now I can quickly adjust for SRA by either using or removing the mat. A somewhat crude method of SRA adjustment, but serviceable. I found the Herbie's "Donut" mat to be sonically neutral when used on the Gyro SE platter. Apparently the materials are a good match. The improvement in sound from the stylus tracing the groove was superior to any (if any) degradation in coupling of the LP to the platter. That's using a micro-linear stylus. There may not be the same effect when using another stylus profile.