Dave,
I haven't done too much leather, but have made a couple knife sheaths and a saw sheath...I've done a couple other things I won't show anyone...
Here's a sheath I did for a saw I submitted for a tool contest last year on WoodCentral.
Here's a poor man's stitching horse...an Emmert Clone! Skew the jaws, rotate it, and secure the leather in between the jaw ends. You can see that I have thick 1/4" leather lining the jaws. I know a lot of folks say the pattern makers vise is more trouble than it's worth, but for my purpose it is one of the most useful vises I've ever used, and this is yet another example of something it does that is not easily done with another vise. BTW, you can see a multi-purpose awl from Craftool in this photo, it doesn't work nearly as well as the Osborne, IMO. That's a small knife sheath in the vise, but you can't see too much of it.
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Life is about what your doing today, not what you did yesterday! Seize the day before it sneaks up and seizes you!
Alan - http://www.traditionaltoolworks.com:8080/roller/aland/