When I got the Suehiro gokumyo 20k I fell in love with the base. (the stone is not attached, but just fits in the rubber base when in use)

I put a WTB in the classifieds for the base only and a kind hearted member saw it, sent two of them to me and I use them for just about everything but the diamond plates. For those I use the standard rubber/steel bolt thingie.