Weird flat screws? Help please.?

Question

I'm trying to dismantle this desk that my grandfather built for me when I was about nine. I was doing okay but there are these weird kind of large flat screws that are all over the place. They loosen up when I unscrew them but after a second they won't go any further. I turn as hard as I can but I can't unscrew them either way. What the h**l? How do I get this stupid thing dismantled?

Answer 1

Some screws appear as screws but they are actually cam type attachments, Try backing it off 1/4 turn and that will release the cam then tap the thing apart. A lot of furniture manufacturers use this type attachment.

Answer 2

Give Perry N ten points. He is right.