I have a few Ibanezes consisting of RG450s and RG570s. The 570 is great, especially with the LO PRO trem.
My RG450 is a great guitar, nice sound, pretty colour, nice (fatter) neck but even though i thought my TRS II stayed in tune pretty well in reality it didnt.
On the weekend i was playing the 450 and did a few whole note bends and so on and what do you know...guitar went flat :S so i thought stuff this.
Out to the shed i go, i first pulled the 3 springs at the back of my bridge, releasing the trs trem. i now had an empty cavity....what now....
I decided to place 2 flathead wood screws in the back of the cavity, that way i can adjust them to stop the bridge moving forward and strings goung flat you can see this in the diagram labelled (1) the reason i chose wood screws is coz they have a flat head.
next i made up an "L" bracket out of some metal (3) i had lyinng around, if you do this made sure that is thick-ish steel that wont bend from the force of the trem.
i measured and aligned the trem and screwed the L bracket into place (2) into place, i then adjusted the back screws to push the trem hard against the L bracket. I then put the two springs back in and checked for any movement. NONE at all. I made my TRS Fixed...
Doing this was the best thing i have ever done to a guitar period. Being a floating bridge double locking set up originally it has the clamps at the nut of the guitar too, all i do now is i tune the guitar from the machine heads and then lock down the clamps then fine tune if i have to, but because the bridge will not move i have a perfectly in tune guitar. I have given it an absolute thrashing and it stays perfectly in tune, i can also adjust the height of the trem without retuning...hows that.
the best thing is it only took 5 minutes and its given my RG450 a new lease of life. I havent put it down all weekend and my poor 570 is now getting jealous.
here is a diagram of what i did
it works really really really well.