B&H Photo sells locking MFT-mount body caps (red anodized aluminum):
“Designed for MFT cameras, this Locking Body Cap offers enhanced sensor protection with its locking mechanism, preventing accidental removal during transit. Machined from high-quality aluminum and anodized red for durability and visibility, it complements the XLCS Cage and Rear Cage Cover, ensuring nearly indestructible camera protection during transport. With 3x locking points, it installs ultra quick, with no need to check for proper lens-mount alignment.”
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