“Please help me find out what this thing is. I found it in my granny’s sewing kit, but I’m not sure if it’s used for crafts.”
A: "It’s a special clamp used for compressing rubber and other elastic pipes in laboratories. Was your granny a lab worker?"
If I remember correctly that's a book holder, two straps are used to hold the books and that's the handle.
Used on a siphon hose to keep air from entering the vine wile not used, thus preventing vineger growth.
My Dad had some, he'd get them out when we went ice fishing!
Don't Google it, Duckle it!