the previous ownes of the boat, managed to make the bung impossible to remove, (rounded off the square drive) so i cannot drain the boat, any idea's on getting it out??? can i unscrew the bit that holds the bung in place and then put new unit in altogether, is the any structural strength in this part????? sorry its a really poor description of the draining bung, its a 97 mariah if that helps?<br /><br /><br />thanks<br /><br />simon