If you just slide those parts in and out a few times it should loosen up. If that fails, you can touch it up with some sandpaper but you really don't want it loose and rattly.
I would rely on the friction of sliding them against each other to get them to the correct sizes.
Enjoy the build. It is fast, fun and very satisfying when you are done.
I would rely on the friction of sliding them against each other to get them to the correct sizes.
Enjoy the build. It is fast, fun and very satisfying when you are done.