[Synchro909]

Are they stuck at the top or the bottom? You can tell by trying to move the lever. If you get NO movement, they are stuck at the top, if you get a little, the rod is twisting and they are stuck at the bottom. In the first case, do as Tom said, in the second, do as Tom said and you might help things by giving the tube a tap or two with a hammer while someone puts a little pressure on the lever. As soon as there is any movement, you've won. Keep moving it back and forth while adding lubricant and it will come good.
Let us know how you go!