If you use the QTC pill you can remove the keying attachment and it should still work.
Has anyone confirmed if this works?
That screw fits into the inner threads and was needed to provide negative contact on long pre QTC bodies. It goes in to far to be installed at the same time with a pill.
OTOH, there is a screw that fits into the outer threads (think shaved keychain post). It tailstands, supports clip attachment, and includes a full sealing o ring. Just need to get it finished...