Cylinder Drains Open

I have been debugging this linkage for awhile, checking and rechecking dimensions and fits, not understanding why I was not even close to getting 90° or rotation. FINALLY, I see it in Kozo's drawings... Drain Plugs have +/-45° of rotation, but the Arm Shaft only has +/-31° of rotation!

 

I measure about 68° of Arm Shaft rotation between Closed and Open.

Done