I had used medium CA and had a number of 7mm blanks split a piece off while turning, I had by accident used thick CA one day and turned the blank too small and when i went to turn to a bare tube I found the thick had attached every mm of that wood to the tube. It was a perfect fit.
I also have a drill press that drills slightly off center I'm going to remove that chuck and clean it.
I had been drilling the holes with a bit one size smaller than the 7mm first and then the 7mm, this ha helped with the poor fit.