I have been using Polycrystals on my cs-6's and have been very happy other than the fact that the cs'6s are so heavy and fine tuning them with the spikes on are nearly impossible as a matter of fact the other day I bought some of those new widgets that you see on tv for moving heavy items on carpet and darned if they didnt help of course the spike put a pretty good size dent in the thing but the slid on carpet as advertised . And yes call the folks at Thiel the have great customer service Shari is the tops
