M_Boats: Drop keel stuck

Went sailing on a perfect day Sunday. Until I tried to drop the keel/daggerboard/centerboard/??? and it did not go down. Just stayed in the retracted position. So other than just crawling under the boat on the trailer and fiddling with that thing, are there other thoughts/ideas/solutions? And if I want to raise the boat some from the trailer to get more room to work and for the board to drop down some, is there a right and wrong way to do that. I was going to use a jack under the forward end of the shoal draft keel and jack up the boat maybe 8 inches that way. Can that shoal draft keel support some weight like that? Sure is nice to have a forum like this for newbies like me. Thanks