What size is this screw?

[chava]

Hey gang,

The 4-pin receptacle at the power-amp-in on my '74 Suitcase is held in place by two tiny, tiny screws, and two tiny, tiny nuts. I'm missing one screw and one nut.
Does anyone know the sizes? Where to find them?
I tightened down the remaining screw and nut, but it sits a little crooked, and the little ring on the cable can't slide up far enough to be able to lock on. And with one screw, it's going to come loose again anyway...

[chava]

The amp tech fixed it. I didn't ask him about it, but obviously, parts are readily available.