There's also a possibility to lose your machine even if you do use a wrench on it.
It's a very small chance though (5%) so you shouldn't worry about it. You should use a prototype omniwrench or the electric wrench (on lossless mode, hold M and right click to toggle between lossless and cheap modes) to pick up IC2 machines, if you're worried about losing any more machines.
Also, you can just go into NEI, go to the black search box at the bottom, type in the name of the plate bending machine (if you're on 1.4.7 ultimate you can just type in "we want bender" and it should be the only thing that shows up), go over to it and right click on it to give yourself back what you lost. If it doesn't do anything, go to options and make sure you're on cheat mode, and not recipe mode.