Thanks guys for all the input.
I took the shafts to Mikes Drive Lines. Made some instant friends as soon as they found out it was for an Amphicar. Everyone was interested for sure. Should be rebuilt and balanced on Monday. I will let everyone know the results.
The tool for those crazy 12 point bolts that hold the prop shafts to the water transmission is called "A 8 MM Spline bit" I got a whole set with 10 bits for $12.95 from Wholesale Tool. There part number is #6036-0680. They were a correct fit.
So thanks again, David, Dave, Ken, Ron and everyone else. What a great group this is, just ask a question and you get a world wide response.
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