"Hacksaw, Hacksaw, Hacksaw, Hacksaw"
Thats all it took, 4 quick cuts through the last 0.010" where the last holes were left just clear of the vice jaws and they did actually just come away.
I use a 1/4" split point stub drill and 2 1/2" turns of the handwheel (0.25" to space the holes.
Now if like some members on here I had a water jet cutter at my disposal I may have done it differently.
J