Any old time Pettibone service tech's/mechanics out there?

I have a 1971 Pettibone 88 Extendo that I am working on, and in need of some help/advice/part number cross reference etc.

I am having a terrible time searching for info and parts online, and I have talked to Pettibone directly, as well as some Pettibone dealers, and they are of little help for a machine that is so old.

Maybe someone knows a better website/forums where I can find some Pettibone enthusiasts?

In the meantime, here are some photo albums of the machine I have been tinkering with:

http://ift.tt/2gKG5p3
http://ift.tt/2fPEc6d
http://ift.tt/2gKQ5yH
http://ift.tt/2fPKUZP

Any old time Pettibone service tech's/mechanics out there?