I would love to see pics of a Weed machine.
Okay on the shuttle, look up Whittler or ier Mechanism, it is from side to side in a very short arc. I found this one day while looking and can't remember where but I wrote it done so I would have it. I don't know if it is Whittler or Whittier mechanism. Thought it was interesting information. I hope this helps you out.