menace, nice so far. needs a bit of tweaking still i think...
the metal y shaft looks like it has threads. these will eat away at the wood where it rest, like a saw!
you could attach a smooth metal surround piece to act as a brushing to protect the wood.
the cotter pins will probably wear into the wooden sides and carve into them. this may also cause the springs damage... as well as the pins comming loose or bending
the metal ends that attack to the wood arnt so pretty... in my design... i took a thick wooden dowel and drilled a hole though it. then glued the dowel to the hand grips (after sawing in the correct angle) Since your grips need a greater surface strength - you could use a simuar technique but just glue the dowels to the woodblocks. Youll still want to pop 2 or 3 micro screws into the dowel fron the woodblock side - for additional strength)
you can use the dowels as a means to keep the shaft from moving. leaving just enough space for smooth movment.
Drilling holes thru the dowels.. you then screw in some bolts into the shaft. the nuts will be on the underside of the dowel so as to be invisible yet easy to access later on - if ever needed.
funny enough... we both ended up using the same gears! : ) they are great. heavy duty, and good depth so as not to slip.
the springs look too flimbsy. you may want heavier duty ones (thicker gauge). Also.. you may want to use a different type of spring for the x axis - as shown in the original picture (cant recall the name of those types of springs) - as they would be better to return the thing to the center properly.
the kind of springs you used will strecth out of whack in a short time period and cause the centering to be off... as well as maybe making an odd echo-ing stretching noise...
ill try to pop some more pics of my yoke up soon for examples..
see dowel on upper middle part... ill try to snap better pics later...

