Its legit no joke.. I went in to the ER with a 'no narcotics' mindset as I was just over 3 years sober.. The nurses knew it was kidney stones immediatley and literally laughed in my face, albeit nicely, when I said 'no narcotics'. They advised I take the narcotics.
I took the non narcotic option and fast forward 30 minutes... The pain was so bad I just threw up in my lap mid sentence and passed out right infront of my partner and two nurses.
They brought me the narcotics after that.
0/10, would not recommend kidney stones.
I just used the threaded metal inserts and seat them with the soldering iron to use orignal screws and have had great luck
Edit/ I should clarify that it's been a few years since I've done one of these repairs and may not be the best option on a newer/slimmer model