This has become a problem lately for me with the Baron. I have had several come back from customers, complaining that the clip gets loose and starts spinning. Pressing in the cap does not help. You have to use some glue like Airrat recommended, but this is also only a temporary fix. First I used CA, but it wont last long. Now I am using 5 min epoxy.
I am not sure what the reason is for this, but was too lazy to start measuring tubes and parts. It looks like it is a problem mainly with Satin Nickel and Chrome, and not so much with TiGold or Black Ti.