The horse is dead

What does that have to do with anything?

The guy didn’t make a part that didn’t fit.

The end user was grossly unqualified to install them.

Take that **** to the bank.

And that’s not arrogance. That’s the truth slapping you upside the head.

Those of us who know, know. If you don’t know, you don’t.
^^^ Here is a guy that is hit in the face with evidence yet fails to see what is probably obvious to everyone but him.
I have made it as simple as I can make it, yet you still refuse to see it.
The OP made an extension of his point above in post #153. There are aftermarket parts that are made wrong and don't fit. How the hell is he supposed to know that THIS part is supposed to work ONLY after making other changes? There were no tech sheets, no warnings, nothing.
To repeat for the 10th time....IF the vendor would have included a memo/notation/advisory that clearancing may be required, then a customer is now aware of a potential issue and can decide to move forward or buy something else. You act as if this isn't necessary but obviously it is.
How much more simple do I have to make it so that you will get it?
You are making this issue far more complicated than it really is. You are also thinly hiding your contempt for people that might need a bit of help.