Hi, I have recently purchased 2018 model PRS SE Standard 24 VC and as it is my first guitar with tremolo bridge I didn't know much about it and at first didn't notice it only has 3 springs in the back holding the tremolo. The guitar only came with allen wrench to adjust the bar, wrench for truss rod and whammy bar itself no other tremolo springs on top of that even though it has holes for 5 springs. I noticed that most custom models do come with 4 springs in and one on top of it in the package. I would also like to ask that when i'm going to switch from 9 gauge string to 10 gauge apart from filing the nut, adjusting truss rod and action will only 3 springs be enough to hold that?