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There should not be a rattle. I can't comment as my reducer is a Celestron one but typically there will be a lock ring threaded into the assembly that should keep the internals snug. You might be able to carefully nip that up just a touch.
I say carefully on purpose, it should be just firm enough to hold everything in place rather than tight and the screw flats to do it up will likely be very close to glass that you do not want to scratch.
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