I've been reading a lot of threads about replacing the old Armstrong air conditioners and the need for bracing. The old unit on my '68 sovereign
was not working and worked even less after it fell on my head and gave me a freon bath in the process of removing the inner skins to reinsulate. I plan on fitting the new unit in the same place as the old one, with the opening for the new one encompassing the two holes left by the old Armstrong unit
I understand that I have to create a 14" square opening and brace between the two skins to take the compression of the unit bolting down. I also gather that the sides of the hole should be formed by stringers ruining from one bow to the next, then crossmembers between them. My questions are that since the bows are about four feet apart, how does one get the stringer down there past all the insulation between the skins; and secondly, how do you actually attach the stringer to the bow?
I had thought that if you got the stringer right up to the bow and then riveted to the shin it would provide some support, but this would place a lot of shear load on a small part of the skin which might lead to problems.
I'd much appreciate any insight anyone can give on this, because I'm thinking it might turn into a major pain in the behind..
Thanks in advance,