Because rebuildables are so popular these days I thought I would include a simple microcoil build on the HHV subforum that can be used on most any rebuildable including the Kayfun. It is a simple microcoil and represents the most common microcoils you will find on rebuildables. There are countless variants to be sure but this build will work wonderfully in most cases. It yields aprox 2.0 ohms. You can adjust your resistance by substituting with 28ga wire, using less wraps, or making it a smaller/larger diameter. The majority of microcoils are made from 28 and 30ga wire. 32+ gauge is too thin. 26- gauge takes a long time to heat up. This build is designed for regulated mods (not subohming).
30ga, 10 wraps, 2mm ID ='s aprox 2.0 ohms
28ga, 10 wraps, 2mm ID ='s aprox 1.5 ohms
Reduce to 8 or 9 wraps for less resistance (aprox 0.1 - 0.2 ohms per wrap)
Use smaller diameter ID for less resistance, larger ID for more resistance.
You will need the following: 30ga kanthal wire (aprox 5 - 6"), 2mm microdriver (or 5/64th inch drill bit), phillips screwdriver, scissors, nail clippers, tweezers.
Hold one end of the wire against the microdriver (or 5/64ths drill bit) leaving a tag about 3/4" long under your thumb:
Make ten wraps making sure the tags point in opposite directions when finished. Don't worry about making the coil pretty at this point. We'll clean it up later.
Compress coils together. Release.
Getting prettier! Ready to put on the device.
Place coil between the connecting screws...legs on the bottom. Keep the coil on your microdriver throughout the tightening process to prevent coil distortion. Wrap first leg around terminal no more than one revolution. You don't want to stack the leg around the screw...one strand width is all you need under the screw. Tighten. Repeat with second leg.
IMPORTANT: LIFT COIL OFF OF AIRHOLE TO PREVENT SHORTING.
Getting there! Trim the legs with nail clippers as close to the screw as you can get. You can also twist the wire till it breaks.
Now we're going to pretty up the coil by compressing the wraps together. Start by getting your coil glowing red.
Release the fire button (DO NOT FORGET TO RELEASE THE FIRE BUTTON), then gently squeeze the coil together with tweezers and hold for about five seconds while it cools. Repeat this glow-compress cycle a couple more times until your coil has no gaps in it. REMEMBER: RELEASE THE FIRE BUTTON BEFORE YOU GRAB THE COIL WITH YOUR TWEEZERS!!!
Your microcoil is now ready to be wicked. Notice the microcoil is centered between the screws and lifted 1 - 2mm above the airhole
Make your wick. I use sterile or organic cotton ball here (I'll show silica at the end of this pictorial). Japanese cotton and Rayon are also excellent alternatives. Pull a piece of the cotton so the strands run lengthwise. How much to use? Try to use the amount in the photo best you can judge and adjust as you learn. After extensive study, more tends to be better than less. You want enough so it drags through the coil but doesn't pull the coil out of place.
Roll one end tightly for threading in the coil.
Feed the wick through the microcoil and pull through. Again, you want to feel some drag as you pull it through but you don't want to be so tight that it pulls your coil out of place.
Here's what it should look like after you have wick pulled through.
Trim wick on both sides. Overall length should be aprox the overall width of the base (or a hair longer is OK). Too long is as bad as too short. Cut to length as shown in photo.
Put a couple drops of e-liquid on each end of the wick to saturate.
Paste the wick to the sides of the deck. DO NOT (I repeat), DO NOT shove the wick into the juice channels. Simply lay them on top.
Reassemble, fill, and enjoy!
If you prefer silica, make yourself a fish tape (a piece of kanthal folded over). Feed it through your coil (photo shows a loose coil). Slip the silica through the looped end. Pull silica through coil (keep your fingernail over the trailing edge of the coil so it doesn't pull away). Trim to width of the Kayfun base (23mm). You're good to go. I use two strands of 1mm silica so that after it is pulled through the coil you are left with four strands. It's a tight fit but it wicks wonderfully.