To toggle between modes, hold down M then press the Use Button (Default: Right Click).
Electric Wrench Modes
Lossless mode has a 100% chance of returning the machine intact and not as a Machine Block. To enable lossless mode, press m and right click. Normal mode (displayed as 'lossless mode disabled') has an 80% chance of doing so, but consumes much less energy.
The Electric Wrench consumes 50 EU each time it changes the output direction of an EU storage block or voltage transformer.