Chainsaw Repair

We call that thing an adjustable pin face spanner at work ..It's used as a rule to take certain couplings and gears apart on machine tools .Meaning high speed automotive type manufacturing .I've got a few myself .

Problem is I'm not sure how they would work on a chainsaw clutch because  they are pretty tight ,might be okay though .In many instances  on machine tools they are snug but not tight as a bulls butt in fly time and  they have a back up locking gizmo to hold them in place .