Store bought hammer mods in Hand Hammers Posted July 13, 2016 On 3/5/2016 at 1:55 PM, Frosty said: They taper from the hammer head to the end, the knob on the end was my thought to prevent a hammer from slipping out of my grip. It's not uncommon to throw your hammer accidentally. I do a similar thing with my hammers. I have degenerative arthritis so some days grip strength can be an issue. I wrap the handle in hockey tape, this gives me a rough surface to grip, and as you would with a hockey stick, I make a knob on the end. I find the knob also gives me a larger area to grip on bad hand days. It's like holding a ball with a hammer attached to it, which on certain applications, increases my ability to do a hinge motion, thus increasing my overall power.