Fabricating hardwood tremolo blocks for a snug fit can eliminate a lot of minor inconveniences if you are not using the tremolo on your guitar. I use red oak, pictured below to make custom fitted blocks...
If you have a guitar with a tremolo on it, the photo above shows why adding blocks can improve coupling to the guitar body, enhancing tone and sustain. Tightly "sandwiching" the sustain block on the tremolo with hardwood helps transmit string vibration the the body...
Once the blocks are fitted, I use the tremolo springs and spring claw to hold the front block in. When the tremolo cavity cover is installed, it rests on the top of the rear block holding it in. The advantage of not using adheasives is it is completely reversable...