Missing Screw

This happened to me with my old Fender Precision- didn’t even know the screw & spring were missing til I went to change the strings one day and the saddle just fell on the floor.
Pretty sure any standard sized bridge saddle screw would do the trick as a drop in replacement- readily available online or at a local music store (probably even in the classifieds here.)
If you’re feeling fancy, now’s the time to upgrade to that high mass bridge you’ve always dreamed of!

 

Fastest fix. Take another screw and spring off and go to the music store repair department. Ask if they have spare parts that may match in their junk box in the shop. If not, try Ace hardware. If not, order new ones from any of the online guitar part suppliers. Springs won’t be so easy to find at Ace, but common at online suppliers.

Tip: they’re metric screws probably M4 size.

 

It's funny but I was just at a Sears store in Easton, Pa. In the back corner, they have a hardware section with drawers containing multiple springs. I looked at some and thought they'd be perfect for intonation springs.
TLDR; Try Sears.

 

I recently worked on an Ibenez Jet King and the saddle screws (intonation screws) were M3.