suggestions on hing repair needed.

[Parnell]

That really is an impressive first effort.  Is your heart set on this type of design?  That is, very short sinew backed, basically a horsebow with levers...
Bet you'd do really well with making a 64" osage flatbow that you could really rely on.  Just my thought.

Way to go, though!

[twisted hickory]

Wow, impressive for first couple of bows. I don't know how sinew would work as I have yet to use it on a bow but usually I just take on either side of hinge to get the rest of the limb working. It will lower your poundage some but it's better than having the bow fail.
Great job on first couple though.
Try some good ol simple 66 inch self bows to get the basics down....At least that is where i am at.
Greg