If you have any questions, just post, I'll try my best to clear it up for you!
Step 1: Gather Materials/Tools
~ Cardboard tubing
~ Coffee can
~ Drill with drill bit larger than chopstick/pencil
~ Glue Gun
~ Glue sticks
~ Saw or serrated knife
~ OPTIONAL: four water bottle caps/cardboard angle
Step 2: Ready Your Tube
Use what you have with these instructions as merely a guide.
Step 3: Measure Your Spindles
I found the best length for me to be the length of my fist. This fits neatly inside my can, and when a skien of yarn is wrapped around it, it only grows about 1" - 2" in diameter, important later!
You will start by marking a line the length you chose (in this case about 3-4") away from the end. Then another that length from the line. and so on down the tube.
Step 4: Cut the Tube
Cut through the tube on each of your marked lines. Don't worry about being perfectly straight, as long as you make a clean cut (ie, no jagged gaps) it will glue down easily and not matter if it is on a bit of an angle.
Step 5: Measure Yarn Stops
Place your spindle upright on a piece of cardboard, about 1/2-3/4" from the edges. Mark two lines 1/2-3/4" from the other two sides, making a square. You can approximate a bit on this, it doesn't need to be exact.
Cut out your square. You will need two squares for every spindle you want to have.
Step 6: Glue the Ends On
Put a thick line of glue all the way around the end edge of one of your spindles. Quickly upend it onto the approximate center of one of your squares and push down firmly.
Put glue on the other end and do the same.
Step 7: Finish Spindles
If you are going to put the spindle onto a spoke, you need top punch a hole into each end to allow it through. A moderately sharp pencil is great for this.
You can then use scissors or an exacto knife to expand the hole to be a bit bigger than your intended spoke.
Once that is done, rounding out the corners helps keep the spindle from catching on anything. You can mark out the rounding, or freestyle it like I do. Either way, take off those corners!
Step 8: Mark the Feed
First, check that your can will be able to accommodate your spindles. Place them inside. If you have a clearance of 3/4" to 1" all around the end cap, you have a perfect can.
Find the center of the top and bottom and mark them. You will be drilling holes here.
Then, draw a line down the length of the can and place a rectangle in the middle. This is where your yarn will come out, so don't make it too small.
Step 9: Drill!
Now you are going to drill in the places you marked. Make sure your drill bit if large enough to make a hole larger than your intended spoke.
Step 10: Cut Yarn Opening
Step 11: OPTIONAL: Stabilize Feeder
Step 12: Load in Yarn
Then take the top off of your can, pull the end of the yarn through the yarn hole, and put the spindle on the spoke. Close the can, lining the spoke into the hole at the other end.
Your yarn should pull through the hole smoothly~