CB,
I have emailed this topic to support and will post their reply when it arrives.
My observations: The original DWF-200 diamond grinding wheel for the T2 was the first diamond wheel introduced by Tormek. It was quickly followed by the DWC-200 wheel for heavier grinding. Tormek specifically marketed these only for the T2. The T2 is specifically designed to only be used dry and is marketed primarily for restaurant use by the Culinary Division of Tormek. The intended distribution network was restaurant supply venders.
Some T4 users, like me, quickly realized that these diamond wheels also worked very well with the T4, especially the more coarse DWC-200. We started clamoring for a series of diamond wheels which, like the DW-250 series for the larger models, could be used in the preferred Tormek wet mode.The new diamond wheels also have diamonds on the side.
Although not part of the original marketing parameters, the new side grit wheels allow the user to correct overground hollow spots on the blade curvature. In the latest online class (Q&A with the Sharpening Doctor), Wolfgang demonstrates thinning the bolster. Although not included in the instructions, I have successfully done this with my T2.
Tormek is commendable for carrying spare parts for older models. However, Tormek does not carry parts for older components when the improved version also works with older machines. When the EZYlock shafts were introduced, the previous straight shafts, stainless and regular steel were no longer available. I suspect that the original DWS series wheels will no longer be produced as the improved DW series wheels are available.
These thoughts are just my opinions.
Ken