I was just looking at rocker levers for my 12v on QuickServe. They didn't list or show as a serviceable part. May not be the case for a CR though. If you want, give me your ESN and I can look at diagrams of yours.
The plastic capped rockers will do that. Early 24V's and I think the 6.7's have metal caps. Never seen them separate. Last time I looked you can't buy just the cap