I wasn't sure where to post this. I have all sizes of pet carriers and crates that I use for the chickens and dogs for transport. I just ordered a new door for one large crate, BUT- I am having such a time removing the screws/bolts/fixtures from the carrier! We sprayed a WD40 type mix overnight, but that hasn't helped. Its the kind that has the screw that goes up into a plastic-washer-type thingy. I hope that make sense to you! I don't know how else to explain it. HELP, please.