Split Nose Bowl (Stock AA1A)
The nose bowl on my stock AA1A was split horizontally by Bill Heard of Bill's Air Service in Santa Monica, California.
I was pleased with the quality and cost (about $300 including shipping).
Bill provided a Form 337 for my aircraft (142KB PDF), which referenced another 337 for an aircraft modified earlier. Bill provided only the first page of that earlier 337.
That left me without the drawings that would be required to repair the modification, if necessary.
So I ordered up the microfiche for the aircraft modified earlier and scanned the Form 337 and attached drawing (1,020KB PDF).