I can only imagine he fell deep into the sunk cost hole. An 1/8” says, “yes, this bears a slight resemblance to what I ordered, but it is not what I ordered. No

I can only imagine he fell deep into the sunk cost hole. An 1/8” says, “yes, this bears a slight resemblance to what I ordered, but it is not what I ordered. Not even close. You might have well sent me a random camshaft.” Why he didn’t abort at that point is beyond me, other than ignorance (in which case he shouldn’t be build avaiation engines) or the above mentioned sunk cost. But even if the latter, he would have ended up selling sub-par parts whether he knew it or not (in which case he shouldn’t be selling aviation engines).