The butt plate was made from some alien metal. Get an ajustable one.
Where are you from??? I would worry about sound. Your ears depend upon it!. Ifd you stripped the threads, try Loc-Tite red. Have you heard of
www.drummaker.com
It doesn't hurt to drill an extra hole here abd there to get a new throw off to fit. How do you like my custom Pearl Masters clone? It only cost me 600.00. 8x12,9x13,14x14.16x16.16x18.16x24, Pearl CZX snare. The snare in the pic is what I just suggeted to you to beef it up. Just using the tung oil will help.
I'll search a liitle for you and help you out. OK?