Hey TBers. Some of you may remember the TB thread a couple of weeks ago entitled "Major Cool" that sedan dad started relating to an Ebay listing for a '72 SVT head with 2 matching square back cabs from the original owner. Well, I've ended up with the rig, and it is awesome! All original, including the factory dolleys intact, with most cosemetic issues being scuffs on the tolex. As the owner stated, it will clean up and detail out REAL nice. As always, I've started my journey with removing (or attempting to) the speakers. So what was Ampeg thinking when they used those "clutch head"/"security head" screws??? Most difficult to remove. I'm keeping them, but replacing them with comparable phillips heads. I've only managed to get a few of them removed in one of the cabs, but appears that maybe the cabs are some of the last of the squarebacks, since all speakers that I've managed to look at are identical numbered 5810144 (first line), 6910001 (second line), 137 7314 (third line), indicating of course, the CTS fairly early '73 mfg. No problems with that. It appears that the insulation on the back section in each chamber may have fallen. Looks to be one piece that maybe covered the back and the bottom sections. Looks like the insulation that was on the back of the chamber wall has fallen or folded forward and is more or less laying on the bottom section of insulation in the chamber. I don't know for sure, but just looks like the one section that appears to have fallen or folded down should be up against the back wall of the chamber. Doesn't appear to be stapled or glued much if any, just stuffed in. So... how is the insulation supposed to be positioned and placed in the chamber???