You can double springs if you need to. Check to see if you have any ball point pens around too. Hardware stores carry springs. Metric screw assortments are at amazon or your hardware store. I used RC car screws on my project. I forget the thread size, maybe M3 or M4. Humbucker ring adjustment screws might fit too.
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This is an example of RC screws M3
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I have M4 and they are too big, so it must be M3. The problem is if you use the short saddles and pull them back they might be behind the string holes in the tremolo block. Also these short saddles weren't designed for through-body string setup and the strings will wrap awkwardly around the saddle right next to the intonation screws.