> > Also be careful of the air plenum, may of them are very fragile now and if > it gets cracked you are in a hard spot. And also if the foam is compressing > too much it will not make a good deal with the bottom of the pack. >
This one looks like it's in really good condition, but I have read about those issues. I'm just going to monitor it closely when initially mounting packs to verify the seals and integrity. As much as I hate to do so, I know it's common to run these without the top cover on for calibration purposes. Any tips for that? Maybe a piece of plexiglas over the heads to avoid any potential dust or should I not worry too much? > The other thing to be aware of is the emergency head retract batteries are > toast and should be replaced with a 3.6v NiCd pack, that way if the power > fails you don't trash a pack. > This is also on my list of things to do. Is there anyway to test this function without using a pack to verify it after replaced?