$517 for a converter refresh?

I've used PTC, Hughes, TCI, among others and the FTI is the highest quality TC I've bought. I know others that use them, and some are running 5's in the 1/8
I genuinely appreciate that, thank you. I'm just looking for something that isn't quite this embarrassing.

And a full thank you to everyone that's input so far, it's nice to hear I'm not being fussy.

Remembered I have a borescope