gluing techniques

I am making a pen for a customer that requires 10.5mm and .492" bits. Don't know how I missed it but I don't have those sizes (usually i forget to buy bushings). What I did notice was that the tubes fit in 13/32 and 31/64 inch holes. They are a little snug but can still be inserted with 2...

I am having some issues with failures on tubes glued in using CA glue... I take the tubes and rough them using 120 gift paper (on the lathe) and then put liberal amounts of CA glue on the tube on at least two sides... Turning the tube as it is being inserted to be sure to spread the glue...