So...if anyone here winds up in Pennsylvania, and has some free time, maybe setup a trip to East Greenville.
You're looking to book time at the on-site museum, attached to the production facility, for Knoll. I know this sounds weird, but you've got to see some of the absolutely bat crap crazy stuff that exists. We are talking chairs with two legs, that only break out near the bottom to balance.
I know this isn't the exact same model...but they have got quite a pipeline for replacement parts...and quite a few older people running their QC area. What you should know is that, for costing purposes, the arm and arm rests on a ton of those chairs used to come from China. The plastic square with the latch that activates the cylinder is composed of metal and plastic components...which are molded into a single piece to both strengthen and prevent any repairs. If the plastic breaks, you buy a new one. The backs, with the plastic mesh, are actually only two pieces. The hard plastic rim is shot with several inserts inside it molded around (or post-facto melted in). The mesh itself is an engineered resin that is shot, loaded into a stretcher, stretched past final size, and shipped. If the skins sit too long they actually spring back to their original size...which makes them a royal pain to actually get onto the hard backing. Yes, they actually tense up over time due to the engineered resin.
What matters most though is why those things cost so much. That $1500 is definitely not in the quality of the product...though they do not skimp too much there. Most of the cost is that long warranty...because if these seats ever break there's a huge investigation into why. When they give you a weight limit, and your butt it too heavy for it, they will usually kindly suggest that your warranty was one time and they will absolutely ship chairs from India back to the US to complete what may be weeks long investigations.
Surprise...one of the companies that does their components is in North Carolina...and it isn't the manufacturer or the assembler getting filthy rich off of a $1500 chair...so you do the math.
Side note...anyone remember the old McDonalds chairs? The ones that were advertised as being made out of recycled materials? Well, turns out they actually are. Paid for a certain amount of recycled PET to be used, which required glass reinforcement to make them nearly indestructible. Absolute pain in the backside to get made, but once done you could probably use one to face off against a lion and win...1920's circus style.