What size are they and what brand? I mean, if they are 16mms they SHOULD fit perfectly. 18mm should be snug.
You removed the top peg, huh? Maybe you could add magnets in it's place? Som of the big BJDs have that.
Mine didn't fit together properly when it came, just like most. I over shaved the top one so I'll need to coat it with glue to to snug it up but it also has a problem with the bottom where it pops open when the head is moved. She's a beautiful doll and I love her but she DOES have issues. I'm kind of hoping someone will find a solution.