Yes. Puzzlement! Lots of “what in tarnation is this thing?!” lol
The U-shaped things lol, IKWYM about landscape fabric pins. Well these are thick & are 4” x 1” and 5” x 1.5”.
I have some of those corkscrew things for holding doilies or what not to arms of upholstered chairs. That thing is definitely not one of them. It measures 1.5” from the top of the circle to the point. Husband just made a guess from a random happening on a web search. He thinks it’s to pull stuck fabric & thread out of the feed dogs & bobbin area. 🤔 🧐🤷♀️
The spring is definitely a conundrum.