I think that the upper seals are fairly self explanitary, as this picture shows. As far as I can deduce these are the original seals from 1970, so to replace them is not a problem.
My concern is the equivalent seals on the main body, to seal the front and rear walls when raised. When the Portafold came there was a sort of seal on the main flat area, so that when the end was raised the seal was way too thick and damaged the hinge panels on the actual end.
When I look at this picture, it looks like there should be a seal in the stepped portion of the main body. I say this because, from measurements taken, it mirrors the rubber seal on the top of the wall. Added to this, is the roof fits down onto the top of the wall and seals onto the rubber seal. With the walls down the roof would fit down onto these stepped areas.
So the question is, what was the location for the original seal for this area?
Any help in this area would be appriciated, thank you
