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You can take the y-truck off without the flat wrench and that will let you bring the y and z-trucks both out of the machine to give you more room.

Since the screw that goes in does not actually thread into this part you can try getting a larger diameter screw to thread into the hole and use that as a grip point for pulling it out, possibly with...

Here are some pictures to help. This shows how it should look on the inside and how the paw is shaped with a curve to accommodate bits. You have the noncurved part of the paw in where the bit goes...