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This piece is called a pivot bar. It connects the pivot shoe (which looks like our 15-087) to the window sash. See if our 26-040 or 26-063 match what you need.

For the piece embedded in the sash, watch the first video below. For the piece stuck in the cam of the pivot shoe, see if you could use a pair of pliers to get it out. Otherwise, you may need to remove or possibly even replace the pivot shoe. See the second video below.