Bob McCarty wrote:I don't see the 12" x 5/8" bolt that goes through the square implement tube, or the boomerang.
I don't think this one uses the long bolt. This doesn't have the blocks but rather a bar and I believe the bar is threaded at each end and uses the bolts shown next to it in the photos (green arrows).
Click on image for a larger view.
Careful you don't lose the bushing (red arrow).