HMMMMM !!! I also have a 17Hobie, when I take mine out I use a rubber mallet, & whack each side a little at a time.....try using WD-40 down the sockets~~ lots of it & just keep workin at it. You might need a heavier hammer, if ya do use a piece of wood(2x4) to help ''cushin'' it... I'm not sure what the others said what to do on the other post's....but give it yer best shot~ Good Luck
~ Vietnam Vet 69-71~ 17 Hobie w/big jib, ~18 Hobie mag,~DN Ice sailor,
and other toys.......
~~ I live in NY state on the north shore of Oneida lake in
Bernhards Bay. ~~~~~~