Thanks for the info. I ordered some tailcaps. Will see how the work out. I got the light through Amazon so I hope I get the caps before a return window closes. It sounds like the play on the cap is common on the SC600 then. I wish that wasn’t there as it sort of takes away from the quality feel. I suppose it’s not a deal breaker so long as it doesn’t cause striping issues when the battery adds tension on the tailcap threads. Mabey I’m over thinking about the issue but I didn’t expect that from a ZL. If it is QC issues I suppose it happens.