This is an old news, I thought that I made and entry but I didn't. Four vent washers that were stuck on the TMS cage structure were all removed.

At first we thought we'd leave them in place as we were afraid of flipping washers, and a gentle touch using our fingers didn't do anything.

This time, we stuck a long bolt in the hole to prevent us from flipping them, and used a clean plier, and that did the trick.