For those that have chosen to go with power tools to spin those tuning pegs, I have a suggestion. Instead of buying the Ernie Ball model or using a large full-size drill / driver that you have out in the garage, consider the Ryobi Quick Turn driver instead. It is about the same size as the Ernie Ball tool and built much better without being as clumsy nor as powerful as the garage drill. I outfitted mine with the Music Nomad bit and the Ryobi can be had off fleabay for less than $30 with the charger. I really don't do that many string changes that I need to go power tool, but it is nice to have and allows for very uniform windings.