A perfect thread of what type?
A perfect modification thread has the initial postings (it can be one or many) with pictures describing the modification completely from how to do it to where to get the parts needed.
Then it has responses from those who have tried the mod, maybe also with documentation, but that's not essential, and corroboration about how easy, difficult, or in between it is to perform and the results.
It's no more than three pages and it gets locked and stickied for all to use for the rest of eternity.