Yep, you got it! I added the square peg and disks to help with alignment and hiding the peg. The score lines will help too, I had a hard time lining things up before. You still have to be careful, with seven positions, only some of them are correct. I did add a bit of glue between the “oreo” to dry first and added more when I put them together. If you try to clamp it tight it won’t roll freely.
Check out the photos from the link. It might make more sense.
Also if you want another style try this one…
No months but still kinda of fun to play with each month.