heres my favorite flaker to use and make, its a moose tine with deer prong.
next i use a grinder and work the tine till it feels right in my hand. i also grind the deer tine and run it through the 1/4'' hole on my diameter guage. i want it to pass through straight with no hang ups and snugg.
then i slde it in.
now i find were i wont my set screw and drill my hole and tap it.
i like to use a smaller drill bit than my tap. i like it to be a tight fit but not to tight when i add my set screw.
if your set screw is to long then use some plieres and grind it down till its short enough. you wont it below the lip of your hole. also make sure you have the right thread set screw for your tap. to tight or to wide and you'll strip the holes out and ruin a nice flaker. and i tell you guys, these prongs really grab those flakes and hold on. you dont wont a sharp point either, keep it more rounded or it will split.
a good med. tooth file is all you need to keep in your tool kit to touch it up now and again. theres something special about a antler flaker when i hold one. i i have a few different sizes and a ishi stick with antler. i love copper as well and find my self mix them up on some points.what is your oppinion on antler? can you get a better hold on those tough to remove edges ? or what about glass or obsidian? i find some stones i like better with one or the other.