Aleph tailcaps - any recommendations for clips?

[Beastmaster]

As part of my recent purchase of two Aleph/Sandwich Shoppe 1x123 bodies with tailcap and two stage switch, I'm wondering if there are any clips that would work with this unit.

A pic of the body (with KL1 head) is here:

One of the holes in the tailcap is threaded. The other isn't.

Any ideas?

Thanks,
Steve