Thanks everybody for the kind words.
The stippling on the bolster are done with a high speed (33 000 RPM) rotary engraver with a small carbide ball cutting bit. It is very important to note that once you start the stippling of the bolster the orientation of the engraver and the bolster must stay the same until it is complete, and the stippling must be random. If you do move either the bolster or the engraver it forms a very vissible line on the bolster, these lines can however be used to create nice patterns on the bolster.
I would suggest you practise this on a piece of scrap steel before you do it on a knife. the engraver tend to run side ways on the steel so some practise would go a long way to control the engraver and be very carefull at the edge of the bolster, you do not want it to run over and spoil all your hard work.
As for the next knife, I am in the process of builbing 2 KMG tipe Grinders driven by one Motor with a variable speed drive.