Metal Thing

thing2
Originally uploaded by a1scrapmetal.

I found this at Crewe market in a box of sewing items.
I am not sure what it is, although my guess its for ribbon threading (or threading new elastic into your knickers).
It can be tightend up to hold something in the teeth.
Am I right?

THING

thing
Originally uploaded by a1scrapmetal.

Another view.
N.B the little slider that tightens up the end teeth.