Originally Posted by Map tester
I had a regular crank arm puller for a standard square, tapered spindle. The small end that pushed against the spindle was too small to work with a ISIS hollow spindle. Talked to my LBS and the wrench sold me a slightly larger end that works with the ISIS hollow spindle. Price $1.00. I like my LBS.
If he sold you the Shimano crank extractor extension then he either did know what to charge or he was making a point to give you a great deal. That part costs dealers almost 3x the $1 you paid. There is a knock off of that same Shimano part, but it still costs me more than a buck. Indeed a good reason to like your LBS.