Roger, the others here have covered this very well, but I couldn't
help to add something. I have always ground the final edge by hand
because my Sears grinder runs so fast that I was afraid of overheating
the edge and ruining it. I have a course diamond sharpening rod and It
probably takes me about 30 to 45 min to form the bevel. Now, even if
you had to use the guide device, most of the metal would be removed.
If you keep using the diamond, you might get better at hand sharpening
than you think.