So I improvised.
Note: Giftie is not crafty or artistic. You can do this, too, no matter your skill level.
I simply removed the spiral binding.
I used an ink pen to pry it apart a bit.
My fingers did the rest, but you could use pliers.
I thought of just hole punching it.
But I decided it would look neater and stay together better with washi tape.
Pull the tape out in a strip longer than the paper, then place it evenly against the edge of one side of the paper, using the paper itself to line up the tape.
TIP: This sounds weird, but tape top to bottom and let the roll of washi dangle a bit at the bottom. If you tape bottom to top, the weight of the roll will mess you up.
WAVES HAND AND PRETENDS TO BE LUKE: You see no dirty laundry in this picture.
Once that is done, pull out enough tape to go around the back of the paper and continue taping the paper.
Trim any excess.
Don't worry about perfection. It will look good in your binder because the taped part is covered by the rings. I promise!
WARNING: This works best for monthly planners (12 pages or so) or weekly calendars (52 pages or so). I would not do this much work for 365 pages. As it is, I am doing this three months at a time, which takes about 30 minutes (including removal of binding, which only has to be done the first time).
BONUS TIP: Save the plastic cover. Tomorrow, I'll show you how to use it to make page markers.