Action pieces missing

[Abigsnowman]

Hello everybody I am new to the Bass and while preparing to give my instrument a proper tune up I have noticed that the pieces for one of the strings that you insert the allen wrench into to change the action have fallen out. I have tried googling action bolts, screws, pieces, etc... I do not know what they are called or where to find them. I am pretty sure I am just overlooking something as I would not think they are hard to find. On top of wondering what the name of these pieces are, I was wondering where to find them? Hardware store? I have looked at bass replacement piece websites to no avail.

Thank you for your time!

[hdracer]

Take one out of the bass and go to your local hardware store.
They should have the "set screws" you need, ether SAE or metric.

[Abigsnowman]

Thank you so much!