Tch!
If you'd bought
MY TOA 130 you wouldn't have this problem!
Its not
strictly a 'split tube' design. More like it can be disassembled - if that's any clearerer. Apart from the elements in the cell, the whole tube assembly CAN just be unscrewed. In some respects this is a good thing. It makes for a very tight seal, and simplifies 'home maintainence'
Anyway. Don't worry. You are not the first to get a 'loose' Tak and you probably won't be the last.
As Hans correctly points out, it should not affect the optical performance providing collimation is OK.