A scissors beats them all!
As always, the key is to have the right tool(s). In this case I am using a needle-nose pliers, but I since found out that a scissors is really the perfect tool to loosen (and even tighten) your heat coil 1-2mm or so. The important part is that your tool has somewhat of a taper. I also had good success with a “spade bit” (drill bit). It’s not in this video bit look it up and you will see what I mean. It has a nice shape to help grip as you are bending. Be careful not to bend unevenly, or the coil will become cooked. If this happens you can usually just press firmly back the other way and hold for 5 seconds or so to straighten it again. Using this technique I took a mm or two off of the diameter to make an extremely loose coil fit with just a little wiggle room to keep the banger from being crunched as it heats up– since quartz can expand faster than the coil resulting in cracking of the quartz banger!
You may be wondering how much you can bend your e-nail coil before breaking the sensitive thermocouple sensor which is found within the heating coil. This is actually a layer which is “sandwiched” in the middle, throughout the length of the coil. This means that aggressive bending could crack and separate this component, leading to an “EEEE” error message– indicating a failed thermocouple. You will want go easy on it. Just bend it slightly and slowly while holding for 5 seconds or so. Do this over a few cycles and you will be able to tell that it has changed a tiny bit. It’s also better not to go too fast because it’s easy to get the coil crooked and un-even. If you do small increments it’s easy to correct any over-compensation.