Because I am somewhat uncoordinated in the field, I have always worried about my hammer being lost on an outcrop - or at the bottom of a hill down which I started to fall. Therefore, I designed and built my first hammer holster. I soon found deficiencies in its design, and made improvements. I am currently using the Mark III (there were several Mark II versions); however, it has broken. To be fair to myself, when it broke, the hammer stayed attached to me; however, the electrical tape which now keeps the pieces together is unsatisfactory and it is time to make another major improvement. I am designing the Peterson Mark IV Tactical Hammer Holster. I will show it here in various steps.