flaker

3/8 inch Brass male air compressor fitting or Brass Cabinet knob
Metal Drill bit with corresponding Threading Tap
Matching set screw (10/32, 10/24, or 10/24) as short as possible
5 minute 2 part epoxy glue
7/16 Wood Drill bit (Spade type)
3/4 inch Hardwood Dowel, Delrin, or Antler material about 4-6 inches long
3/16 or 1/4 inch Metal Drill Bit
Sandpaper, WoodStain, Polyurethane, etc. (Optional)
3/16 or 1/4 inch copper ground wire (4 inch lengths)

Making your own pressure flaker is so simple that I can't believe there are people out there who are selling them for $15-$20! I find it even harder to believe that anyone would actually BUY one, unless you have absolutely no access to tools or a friend who's handy!
First, go to your nearest Home Improvement Center or Hardware Store to pick up the items on the material list. Personally, I prefer small Hardware Stores because the folks who work there are usually more knowledgeable and friendly. Explain to them what you're doing, and not only will you get some good laughs, but you'll be surprised how many people have a vague interest in Flintknapping and how it's done.
Take the compressor fitting or cut off cabinet knob and drill the correct sized hole about 1/4 inch from the tip. The end should already be the right size for the copper wire that you're going to use, but if not, drill this out to the correct size at this time also. Now, take the tap tool and tap the threads in the small hole that you've just drilled. Check to make sure that the set screw fits and threads in easily. Now take a piece of dowel rod or other material for your handle and drill a hole in it lengthwise to accept the long piece of wire that will be used for flaking. Carve it, sand it, and/or just generally shape it til it fits your hand well and feels comfortable. Now, drill a hole in the handle material to accept the brass fitting or knob metal. Take some 2 part epoxy and glue the fitting/knob into the handle. After it dries, take a very sharp knife and some sandpaper and make it look nice and tapered. Some of the glue may have dried in the drill hole, so you may have to pass the drill bit back through it again to clear the glue. Insert the piece of wire into the handle down til about 1 inch or so is exposed. Tighten down that set screw, sharpen it til it's about like a dull pencil, and "Go to Pressure Flaking"! You've just made a wonderful tool that will last for years and didn't cost more than a couple of bucks. I like to make several at a time so that when I'm in the "Heat" of working I don't have to stop so often to resharpern. Enjoy!!