The Widgeon Manual that should have arrived today should give a good explain for this problem..... but, here is something that I may have left out..... The CB actually pivots on a plastic bushing, the bolt goes through that to hold everything in. The Bushing needs to be about 1/8" or so longer than hte CB is thick so that compression from the bolt will be against the bushing, not the CB. Some owners have lost the bushing and now the CB binds. Same deal on the DS II. My Widgeon used to develop a "vacuum in hte trunk that prevented the CB from dropping, I had sealed the 2 holes in the CB trunk that were used for a pin to lock the CB up...... as soon as I opened one, it let air in and the CB would drop.
Oh, and after helping out a couple of other Widgeon owners, I discovered that it is a good idea to verify that the 2 lines (up and down) are rigged correctly, one owner couldn't lower the CB because the 2 lines were rigged so that when he pulled on the down line, it also pulled on the up-line! It took me longer to drive the 3 miles to his house than it did to fix the CB, and it works fine now.
Good luck!