Just to add, real glad you found the problem s-man58
I think the play in the BMW rim is a known issue, I had this play with the BMW rim, that it actually had broken off one of the male pins and had gotten stuck into the main CSW base...I did managed to get both base and BMW rim replaced, but the play is still there, I have to use the fixing screw to stop the play, as you say Bose321, it's stop being a "Quick" release