Instructables
Picture of Best Yarn Puffballs (Removable or Permanent)
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This tutorial shows how to make a yarn puffball (a.k.a. pom-pon). I believe this method is more sophisticated than the other methods I've found online. It produces more durable puffs that can be attached temporarily or permanently.
 
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Step 1: Items you'll need:

Picture of Items you'll need:
1. Yarn (between 150 and 200 yards)
2. 30" Crochet thread (I think this is size 8 but I'm not positive. For this application, the bigger the better, we need it to be strong.)
3. Empty soda can
4. Darning needle
5. Scissors

Step 2: Wrap the yarn around the can

Picture of Wrap the yarn around the can
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1. Tie an overhand knot 
2. Tighten the knot on the can
3. Wrap the yarn around the can. I made 225 wraps for this puffball.

Step 3: Prepare a constrictor knot

Picture of Prepare a constrictor knot
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Constrictor 3.jpg
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Using the crochet thread, prepare a constrictor knot approximately 3" in diameter. You'll use this knot to bind the loop in the next step.

The diagrams below show how to tie a constrictor know using paracord so that it is easy to see. 

Step 4: Tighten constrictor knot around yarn coil

Picture of Tighten constrictor knot around yarn coil
Constrictor On Yarn Puff.jpg
Tightened Constrictor.jpg
1. Slide the coil of yarn off the can.
2. Slip the constrictor knot around the coil of yarn.
3. Pull the knot tight. The tighter the better (as long as you don't snap the thread). If the thread snaps, simply cut it off and use a new piece of thread. The great thing about using a constrictor knot here is that once tight, the knot will not loosen.
4. Tie a simple overhand knot secure the knot. (Just to be complete, an overhand knot is the first knot you tie when you are tying your shoe, before you tie the bow.)

Step 5: Cut open and trim the puffball

Picture of Cut open and trim the puffball
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1. Hold onto the thread and cut around the coil. Once you've cut all the way around it should look like photo #2.
2. Trim the excess yarn until it is shaped like a sphere. This much yarn will produce a nicely shaped ball approximately 3.5" in diameter (see picture #4) but you can also trim it down to 2.5" (see picture #5).
Excellent instructions! Thank you for sharing! :)
Wow, I didn't know that there was a different way to make puffballs to the way that I knew.
Nice, and the puffball comes out really good. :D
Very nice! Great instructions. :)