Originally Posted by
mech986
If they are glued in, it won't be easy to get them out, sometimes a heat gun or similar will soften the glue enough to allow you to grab the post and twist it out. The original material sometimes gets brittle so it may snap one edge off. If the top breaks off flush, then use an Alden Grab-it or similar easy out to grab and pull out the remnant.
The post can be replaced by used originals or the delrin repros that Ebay seller sign-shop sells, I've used them and they are nice but not inexpensive. But they do have the new grip that will hold the grilles on if you use them.