Andy,
Anytime, just ease up a little when you are pulling your threads tight, too much and they will cut right through... Good luck.
25b,
C.S. Osborne description- Stitching Chisel - No. 700 "This punch is designed for saddle stitching. Forged in one piece. Prongs 3/32" apart."
Like I said, It requires the use of a Diamond awl to open the holes properly, just like a pricking Iron...