Maybe it's just the loom GM uses . [emoji848]
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I'm convinced it's this. With as many NBS trucks I've had my hands on, most still had pretty decent loom. My '08 is missing it everywhere and what remains is about as flexible as a potato chip. I'm sure climate plays a big part in it as I see pics on here of northerner's engine bays and the loom looks great. I'm sure GM switched to another supplier with a lower-quality loom, possibly midway through the GMT800 era. Maybe it's the same plastics supplier that made the GMT900 dashes.
If I can't find a known good brand of loom, I may go to the salvage yard and study what's on the other cars and maybe even rob theirs. If I find a 10-year-old car with pliable loom, then it's obviously not the crap mine came with and I'll see if it'll survive being removed and reinstalled.
But, I'd rather a smart guy here chime in with something like "I'm a chemist/engineer at X company and we produce plastics for this purpose. You want loom made of Xychlorothemethylenonius #1464G (fictitious chemical name example) and it's available for $(cheap price) at
www.(Amazon link).com".