Umm, is it just me that thinks of these tools as overkill? I could see needing the kid gloves way to grip the serrations on an Iwata the first time..... but the GSI's have a nut around the base. I used a regular old 11mm wrench to take the 270 head off the first time, its not on there at 100ft-lbs or anything. If you wrench is rough garbage and your worried about putting unnoticeable scratches on it just put a strip of paper between them. After the first time you'll only need your fingers.