take the bolts out from inside the deck, remove the plate and make sure ONLY the weld is attaching it to the deck. then, either grind through the welds or use a hacksaw to cut through them.
in your other thread you posted 10 shipped. i said id buy it. you said 12 shipped. i said ok. now you say 15. 12 is the highest ill go, i cant pay 15 or i wont have enough to buy something else i need more than a headset.