These days you can buy a variety of types and styles in a range of prices and with a few notable exceptions they all work in essentially the same way.
I learned to spin on bottom whorl spindle but tend to use top whorl spindles now. If you know the difference you'll also likely know what you like. This design can be used either way or can be switched between the two styles if you find you need one or the other.
Spindles can be purchased in stores or online for anywhere from $15 or $20 on up to ...a lot. Especially if you want antique or custom "hand crafted" spindles. On the other end of the spectrum you can make them out of rubbish and free things for literally nothing but time.
This will show you how to make a decent looking functional spindle for a few bucks. About $2.50 in this case.
Step 1: What You Will Need
A two ounce block of oven bake polymer clay. I got mine from an art supply store for $1.89. (I chose orange in honor of the spindle being created specifically for an Instructable.)
A chopstick. I used a large bamboo chopstick but you could use any you like. Wood, plastic, bamboo, pretty much anything will work.
A small screw hook. I just had one laying around but you can buy them for pennies or if you sort out how to attach it to the spindle you could make a hook out of a piece of wire.
You will also need:
A working oven to bake the polymer clay. Just follow the directions on the package.
Something to start the hole for the screw eye. A drill bit or an awl should do the trick. If your chopstick is soft enough you won't need anything but most are harder material.
If you're chopstick it too long you'll need a saw or pocket knife to cut it down. Mine was a few inches too long. I used a pocket knife to cut it down. The chopstick started out about 18" long and would have been OK that long but it felt awkward. It would have also made the spindle a little heavier than I wanted.
The whorl should slip fit tight enough to not need anything holding it in place but you might want to grab a rubber band or an "O" ring or something just in case. This is the fourth spindle like this I've made and none have needed anything so far.
Step 2: Optional: Cut the Chopstick to Length
As mentioned earlier, weight is the real critical factor in this. A heavy spindle won't make light thread, at least not easily. A light spindle can't make heavier threads and yarns very well. Mine are all kind of middle of the road and that's basically what you will get with this project if you do it like I did.
You could also make a single spindle and several whorls of differing weights and sizes. You could then just swap them out as needed.
Just cut it if you need to. If you aren't familiar with how to cut a "stick", maybe you ought to just ask someone...
Step 3: Making the Whorl
The polymer clay came in a rectangular 2oz block. I used 1.5oz for this whorl. Again, is just felt right. There are lots of different weights available on commercial spindles. The nice thing is for this one you can either make a heavier one if you feel like you need it or make a whole new spindle.
You can use a jar lid or even a round cookie cutter to keep the shape nice but as long as it's balanced it doesn't make much difference. Polymer clay is pretty stiff at room temperature so I didn't bother rolling it into a ball first and simply shaped it by hand keeping it even by eye. Since polymer clay is relatively tough stuff once it cures and your spindle won't be spinning with enough RPM to worry about wobbling unless it's very out of balance.
The clay I used cures in the oven at 275F/130C per 1/4" of thickness. So I tried to keep it right at 1/4". I have done cup shaped whorls and ones that thin toward the edges without trouble. Just keeping it simple this time.
Once you have the whorl shaped in a disc you simply eyeball the center point and gently work the spindle through the clay. It will cup slightly but that's OK. You need to be very careful not to make the hole bigger than absolutely necessary. Polymer clay shrinks slightly when you bake it and if you haven't made the hole too big you get a nice slip fit that's just right without needing anything to secure the whorl.
After you have made the hole gently flatten the whorl back out carefully avoiding deforming the hole. This will also "shrink" the hole ever so slightly.
Now bake the whorl however the package tells you to. Be careful to follow the directions. Most polymer clay will burn and get ugly or worse if baked too long or too hot.
(Most people who spin either own one or "many". I'm in the many camp. Though, I think I only have half a dozen at the moment.)
Step 4: Add the Screw Eye
Just make a small pilot hole and screw it in.
Step 5: Assemble the Spindle
You can wait until the whorl is room temperature or while it is still slightly warm and pliable slip it together. This has one advantage in that as it cools the rest of the way it will shrink a bit more and stay in place better but it's probably fine either way.
All you need to do is gently push the spindle through the hole in the whorl until it's a few inches from the blunt end with the hook. It helps to rotate the spindle a little while you thread on the whorl.
If you assemble the spindle while the whorl is "hot" it can crack the polymer clay and you'll need to make a new one. Warm = OK / Hot = NO
(This is also when you will want to add a swank Instructables Robot to the spindle.)