I also have a Viper that I just purchased this summer for $100. It appears to be mostly intact. In fact, I have sailed it a couple of times, but have had to "engineer" a couple of things to get underway. I have the original rudder assembly and dagger board and would happily photograph, measure (or whatever you need) them for you (all).
I learned to sail when I was a teenager but have not sailed since and am 55, now, so I have no knowledge to impart. I do, however, have some questions I am hoping someone can answer.
1. There is a base for the mast mounted topside, toward the bow. The bottom of the mast has a groove. The boat was missing the part that would span the base and fit into the mast groove. I have no idea what it should look like. I purchased a lag bolt at the local hardware store and it works fine, but would like to know about what SHOULD go there.
2. There is a spring-loaded clip on the stern between the two posts that the tiller assembly slides down onto. It is to keep the tiller from slipping off in case of capsize. I broke the thin springy metal piece. Anyone know where I could get a new piece or an alternative?
3. The boom gooseneck slips into the opening in the mast, but slides straight down to the bottom of the slot. Obviously, it should not go down that far since the boom would be too low to swing side-to-side, nor could I duck low enough for it to swing past my head. I assume there should be a lock or stop on the gooseneck to prevent it from sliding all the way to the bottom.
I was thrilled to see some current posts on this thread and look forward to trading some information.
H.