Yup, it's great to hear an idea worked...I was in Home Depot yesterday and saw a set of plumbing wrenches that looked like spark-plug wrenches.

They came in several sizes and I thought SURELY one of these could be jammed into the insert and used to remove--they are all 6-pointed.

There are a number of plumbing wrenches that work from the inside...It just occurs to me that I have 19mm and larger hex wrenches (Motorcycle axle wrenches) that would work as well.

Still, it's all the same idea and you solved it with something similar.

"I love it when a plan comes together!"