Hi, I have tried some searching online but can't find anywhere to buy a slotted bit socket for removing cz 858 fixed stock and installing folding stock. I am not sure what size of bit I need for the stock screw either, I used my callipers on the folding stock screw and got 0.087 - 0.090 inches for width of screw slot. But it seems slotted bits are measured in terms of screw head diameter.