maybe a little over descriptive...............can't really measure it. I will just say..........looking at it under the microscope, the sight paths on either side of the heel should be identical, as identical under the scope as possible. Under my emz 5 that is.
I have found in my learnings (everyday) that the geometry of any graver/burin at any intersecting point is VERY important. To the point of using for 20-30 minutes before dull.......not broke. If one of the heels appears to be microscopically different than the other side..........you are headed...
T.D. I just ordered those 40% er's from amazon........nib on one end,brush on the other. I played with them at Micheals and give them some thought. They spread quite well, can't wait to see how they transfer. Thanks paps
I thought I edited the whole response .....gone. But didn't. I typed before re-reading the original post. Thunderbird was the ;last phrase that did not register.
I apologize........I neglected to add when using the 1/4" square stones...........I use alcohol as the cutting lube/wash. It does a good job. Followed with 400-then 600 paper.
I use the Gesswein 600 1/4x for rough areas and it works well. To follow with 400,600 etc. These stones are best bought in the box rather than individually I think due to pricing