Could it be that when the original seal was removed, Only part of it was lifted, Sort of, Split and only 2mm actually removed?
I had to make one for mine, I can recall it being quite thick too!
I also had to make one for a Cadet Major, That was very deep at one edge but is wedge shaped, I had to glue two pieces of 4mm leather together, I then made a one piece punch on my lathe to ensure concentricity, It only worked once though as the edge folded over when it hit the hardwood that the leather was sat on!!
EDIT- Having now fully read the original post, It's obvious that it was all removed!
John![]()