What was the use of this little key?

It looks like some form of bleed key, but since I have not seen one like this before I thought I’d call on your thoughts

 

Does it wind/screw in anti-clockwise? If so, it could be a clock-winding key?

 

Hmmm, reminds me of a swivel mirror bolt.

 

I would say it is used to control the flow of liquid through a valve. Screw it one way and it lets liquid out; screw it the other way and closes down the flow. Same principle as a central heating radiator thermostatic valve.

 

or for an old carb to regulate the gas or air amount.

 

That would be my thinking.. just wondered had anyone seen this specific type on use

 

Thumbscrew to hold a sawblade in place maybe. Like a jigsaw or bandsaw maybe.

 

There is a twigg manufacturing Company that makes precision fabrications, supplying both military and commercial aerospace firms In Indiana .

 

It's definitely some sort of adjusting screw. From what I have no idea.

 

Possibly for holding something in a lab device ala a "Christmas tree stand " configuration.......

 

Locksmith hubby thinks it's also a "bleed" key to open and allow gas or air to release and then turn the other way to close it again. I tried looking for Twigg as a manufacturer, but didn't find anything.

 

I looked at them but it says they're only 40 years old. This key is older than that.