Capainleeward,
The guide clamped to the grinder fence is a great idea and beats trying to do this free hand. I have been chucking the center punches and prick punches in one of my cordless drills and then "attempting" to hold the spinning points at the appropriate angles to the grinding wheel. It never works very well. Laying the spinning punch the grinder fence would keep the points at the correct angles. Thank you for the photos, Paul