I also use a empty protank head. I made some DIY bobbin threaders from youtube and have them tight enough so its difficult to dispense the wire. Made a wood jig to clamp onto my desk to hold the core wire with the drill standing up, use quality spinners or your work bucks and twitches as your coiling. I only make @10 inches of clapton at a time, enough for 2 builds. IMO its very difficult to maintain a consistent tight wrap using your hand to hold the spool, trying to follow the wrap with one eye and the spool with the other eye. The PT head eliminates the need to watch the wrap so it doesn't overlap. If it does(mostly from bouncing core wire from not being in the center and spinning too fast) then back off some of the wraps then continue again. Once you get the clapton going then one hand to hold the drill switch and the other to stop the wire from bouncing if you don't have it exactly in the center of the chuck, I never have to touch the spool until your finished and overlaping a few end wraps to secure. It makes great claptons that the wraps don't space out some as your building the coil.