I searched and really can't find the answer to this anywhere. I have a pair of Tecnica Inferno Blaze boots, about three years old or so. They have two removable rivets in the back. I used them with the rivets off and the plastic holders in place instead, and as I progressed (and, um... got a bit fatter...) I am looking to increase the stiffness to 110 by putting the rivets back in. The problem is that the plastic holders are either stuck, or I don't know how I'm supposed to take them out. There is nothing in the little manual that came with them or on the Tecnica website. Do I just muscle them out somehow? I really pushed hard with a little allen wrench they provide, and other right-size objects. I don't recall a special tool for this, they look like one of those snap-on things. They turn in place freely, but just won't come out. Any advice? Thank you in advance.