ADDITIONAL SWING FRAME NOTE
For anyone building a swing frame or having one built, I neglected to mention something. In addition to the uprights being perpendicular in two directions, placing a rod or dowel through the holes of the two uprights while welding will help to insure that neither of them is twisted slightly. If twisted, the pivots you mount later will tend to wobble.
I don't have a dowel handy, so I'm showing with an arrow. I hope it shows what needs to be in a straight line.
(Frame Axis)
[ATTACH=CONFIG]520802[/ATTACH]
More soon,
John