I've never seen the item of which you speak. You could try catching an edge with a dental pick or something similar. If the washer hole is smaller than the hole in the block you may be able to kind of thread a screw into it and pull it out. Oh, and welcome to TBN.
I've watched some YouTube videos on getting these out, I'll try the pick idea first,this willa ll be a first for me and don't want to mess anything up.