Iīd form a sheath from damp leather and sew it togehter. Thatīll ensure optimum fit. Itīs pretty easy to do. The trick is the proper dampness of the leather. I made a sheath for a folder with the size and weight of the Buck Ranger. The folder is held even when the sheath is held upside down. That should be thight enough.
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If it isnīt broken, it doesnīt have enough features yet.