Tiny rear drop-out screws...
 

What might these small screws be officially called?
You know...the ones that insert into the rear drop-outs, and assure proper centering of the rear axle.
Do any of the online suppliers sell them?

Drop out screws , drop out adjusters. When they bend or break off, well I'd rather not speak those.

Maybe Hawleys, QBP or J&B might carry them. Some go to the hardware store and Cobb it together.

Go to Dave Moulton's Bike Blog. Davesbikeblog.squarespace.com. There will be an ad on the right side for Stainlless Dropout Adjustment Screws. Looks like a reasonable price to me.

Got it...thanks!

Bicycle Classics has them.
Vintage Bicycle Parts : Accessories

I have some of those Campy plastic end ones, 80's, if interested. Short ones as I remember.

Huret dropouts take an odd size.

Thanks for the replies and offers!
I'll start at the hardware store, and see what they have in a 3mm size.

I go to my hardware store and buy stainless ones and a stainless acorn nut loctited on for the "knob"

+1, you can also typically find a spring there, it's supposed to keep it from adjusting on its own. IMO, better than the original, since they don't rust. I also have a 3mm x 0.5 tap to clean out the threads, then I grease it as well.

From a hardware store I would look for a 3 x.5 mm socket head cap screw… and get an allen key too if you don't have a big set of those.

They come in different lengths

Another place to try is your local hobby store.

A lot of small metric hardware is used on radio control models.