I could never understand why Lyman made the 310 depriming pin so small. They seem to break or bend with the slightest resistance. I often use the 310 tool to deprime even if I don't load with it. I came across some pins with a head that resembled the 310 pin but they were slightly larger. I decided to make them work anyway. I put the pin in a drill motor which was held in my vice. I turned it at high speed and held a sharping stone to the head until it would fit in the pin holder of the 310. That solved one problem but the pin was still too large in diameter. Then the light bulb turned on. Since the flash hole in cartridge cases was already much larger than the Lyman pin,why not drill out the pin holder. I looked thru my collection of 310 depriming dies and found one that would accept the pin as it was. I deprimed a 45-70 case fist. Worked like a champ. My idea may have occurred to others but I had never read or heard about it. I have attached a picture of the pins I have written about. The pin on the left is the Lyman. The second one is the pin I modified. The others are as I found them. I don't know from where.