Dug out my leather pouch that I made years ago for my bushcraft firekit.
Radius of the bottom was custom fit to my Primal Connection fire piston.
Sucker was “entertaining” to make, since the stitching goes through the top surface of the ends, but out through the Edges of them, Not the other side, so that the ends form a true square corner in the pouch.
Done from a tutorial on either the brittish blades forums, or bushcraft UK forums, Years ago(2007, 2008… somewhere in there).
Will get it cleaned up, and get my new campfire patch from Red Arrow mounted soon. 
Alaskan, Adventurer, Engineer. 
Sweet! I like the look of it!