I acquired a 56 QD17 in parts and have a question about shift detent. The shift lever moves freely from forward/neutral/reverse, but there is no detent in any position. Looked at a parts breakdown on Marinengines.com and didn't see any type of detent device on the parts diagram. Am I missing a part? Any advice would help. I have 3 other 56 Johnsons and they all have detents.