If you install longer shackles, put a bolt with a sleeve over it midway between the top and bottom holes. Longer shackles have a tendency to collapse sideways in a tight turn without a center support.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!