Filimant feed motor drive gear is not locked down

My SV01 had print issues a while back and I’m just now getting around to trouble shooting and I’ve noticed that the brass (?) gear on the drive shaft has 2 screws to hold it in place. Neither are tight though, and my multi-tip kit does not seem to have a tip that fits.

What I’m wondering is if anyone know what size and shape tip is needed to tighten this fitting up with. I have a picture, but it’s not great and taking pictures is difficult due to the small size (gear is about the size of a pen barrel). Thanks in advance!

I’m 90% sure they take a 1.5mm hex wrench. Is there a screw in the hole? It is possible one or both vibrated all the way out.

It looks like there is one inside it, I’ll try a hex wrench, most of the screws are star shaped, but this gives me something to try, thank you!