Tiny Mystery Piece (please read before guessing)

EDIT; if anyone could tell me how to make photos upload it would help. None of the photos I'm trying to add is as large as 1 MB but it keeps saying 'file is too large.'
I recently got this object in a mixed lot of small sterling items. I asked the seller what it was and he said he found it in a drawer at his grandparents' house after they both passed away, so he couldn't ask them. His guess was a needle threader.
Here I should note: For the sake of continuity, I've labeled the parts in the photos. I purposely tried to label them as ambiguously as possible, so as not to suggest a function, only the basic shape (though I think the 'handle' is fairly obvious). See photos of the prongs/loop in their ranges of positions, by pivoting the spring on its' rod.
Okay, so 'needle threader' appeared feasible, like if the groove on the back is for holding the needle in place, with the loop clamping it down, all you had to do was aim the thread into the fairly big hole of the cone on the front, which would funnel the thread through the pinhole, and through the needle's eye.
But I tested it, and it definitely didn't work. Even with my shortest needle, the length of needle extending beyond the top of the disk overpowered whatever force the would-be clamp had to hold it down; the needle always toppled over.
The other observation I made was while manipulating the 'prongs' to raise and lower the 'clamp.' --They were slightly sharp, not quite enough to painfully hurt my fingers but definitely less "finger friendly" than the 'clamp.' This makes me think that IT (the loop in the back) is the user interface, and the prongs are the real clamps, for clamping something to the front. But I don't want to be too biased so let's just say 'loop' and 'prongs.'
I posted this object to the two best Facebook groups I've ever been in, one for sterling collectors and one for antiquers. Usually when I need help, the speed and accuracy is shocking, as both those groups include extremely knowledgeable people. But this object has EVERYONE stumped, and I mean the replies include words like "maddening" and "haunting," LOL!! Of course there are plenty of guesses, but only vague ones like "Something for sewing" and "For making eyelets" and "For stringing beads" but with no explanations of exactly how the object would operate. Some people don't even seem to have noticed how tiny it is, as they've guessed "candle snuffer" and "cocktail strainer", ha.
So does anyone here know, or have a good guess (with a description of exactly how it would work)? Clearly the most common intuition is that it has something to do with sewing, but I'd like to throw in that it could be some other household function, or even medical or scientific. --

 

I don't know how to do that and is that really what it takes to upload photos here? The one I tried said it was 757 kb, far from 1 MB

 

https://www.antiquers.com/threads/posting-a-thread-and-uploading-pictures.15990/

 

Not using a smart phone, laptop computer.

 

What operating system?

 

Macbook Pro

 

Unfortunately that lets me out. I'm a Windows user. Sorry.

 

Komo - Did you not read her post? Her image files are too big! She can't use your instructions yet. Needs to find a way to resize the files.

 

It doesn't even get to the part about 'thumbnail" or "full image". When I select the file it progresses for a while and then comes back with red letters saying the file is too large.

 

But how is 757kb too big? I'm not very computer literate but 757kb IS smaller than 1 MB, right?

 

,

 

Here are some instructions for Mac. Now please tell me what happens, and I'll help you find a way.
"In the Preview app on your Mac, open the file you want to change. Choose Tools > Adjust Size, then select “Resample image.” Enter a smaller value in the Resolution field. The new size is shown at the bottom"

 

Just add the photos to the gallery section on this board rather than directly to the post - I use a Mac as well - Name the files, then create a new post and click the little camera to "media gallery imbed" the images to the post.

 

@Marie Forjan uses a MAC too.