Thanks for this Herb. How many cut-off wheels did it take to do this?
Sorry I did not catch this post earlier, the answer to your question is I used around 10 cut-off discs to cut out the top.
If a person attempts this like I did, a metal straight edge is essential to keep the dremel cutting in a straight line. It will try to climb out of the cut and wander off. I tried a pneumatic cut-off wheel, but ny compressor could not keep up. Also tried a metal cutting blade in a jigsaw but I couldn't keep it perpendicular to the face and in a straight line. The fastest way turned out to be the Dremel.