Here is a sheath that is sitting on the warming rack of our wood cookstove. When I wetform... the leather has been colored with Fieblings alcohol dye. I soak the interior with 90% isopropyl alcohol. Wrap the knife in plastic and then strategically place clamps and popsicle sticks with very little pressure. Not enough to leave a mark in the leather. The low constant heat from the cookstove sets the leather in a few hours. I then pull the clamps and take the knife out of the sheath. Place the empty sheath back on the stove and let it sit there overnight. It continues to shrink a bit more. By the next morning the leather is hard and the knife fits snug.... I then finish the sheath by applying wax and burnish.