Talk:Extractor/@comment-66.183.97.72-20120427203037/@comment-5221777-20120628162347

"Without the Superwrench 100% mod, there is a chance (Aprox 70-90% success rate) that when you do, the machine will not be successfully removed and instead you'll be left with a gutted Machine Block."

Source: IC2 Wiki

However, as the other person said, Electric Wrenches have two modes; low-power will use less energy but has the same chances of breaking the machine as above. High-power mode will use more energy, but has a 100% chance of successfully disassembling the machine.