Mike, Chuck Lebrecht might be able to guid you in your wing rigging. He was the Porterfield Airplane Club President for many years. He enjoys talking Porterfields and just turned 91 or 2 yrs old. His # in Florida is 352-687-4859. I just talked with him last week.
Do you mean the internal wing rigging or the adjustment of the wings using the rear strut fork after fitting? If the former, we didn't do anything, just had the wings stripped and inspected for any damage, which was fairly minimal and easily repaired. We refitted the wings with the rear struts set to the same length as before, on the basis of if it ain't bust don't fix it. The aircraft has flown with a slight aileron imbalance - the left one droops a bit in level flight - for the last 20 years, so we've been adjusting the wings and ailerons by trial and error to eliminate it, not quite there yet but making progress.
We may have been a bit more scientific about the rigging at our first rebuild 23 years ago, but I really can't remember the details after so long. Sorry I can't be of much assistance.
I will hopefully be visiting my sister in Claremont in October for a week or so, with a couple of friends. We hope to be doing a bit of flying at Cable so maybe we can catch up then.
Welcome to the Club. Have you flown a Porterfield yet> Must have---with all those Porterfields at one airport ! It is a very forgiving plane .Your hard work will be worth every penny you put into it ..
So you are another one of those Cable guys. Welcome to our Porterfield Club. Let me know the N# and Serial # of your CP-65 so I can add it to my list. It's good to have you aboard. Keep us posted on the progress of the restoration. We can always use more pictures of Porterfield Airplanes.