The specific use.
They are the bolts which move back and forth when you are using a screw to move something.
Space/Science » in reply to Wow, I've never heard such a thing. Thanks n/t
The Orrery
Space/Science » in reply to Wow, I've never heard such a thing. Thanks n/t
They are the bolts which move back and forth when you are using a screw to move something.