My guess is there's no easy answer to this but figured I'd try in case anyone knew some tricks I don't. This weekend I went to take out the seats and thwarts. I soaked the nuts and bolts down with liquid wrench but I still couldn't get them to budge. This was complicated by the fact I couldn't get a grip on the diamond head bolts without tearing up the inwhales which do not need to be replaced. I would leave it alone, but the front seat is loose and it would be nice to get the wingnuts free on the center thwart. I've seen from another thread here that they are hard to come by.It looks like my best bet is to hacksaw and replace the loose ones and leave the rest unless anyone has suggestions.