Hey Kuan,
I give you full Credit for actually being able to share your mistake with the World. Stuff happens, if your going to destroy something, hey do it while it still smells new. We all have made some nasty mistakes. LIKE, when I was 16 I did a rear brake job on my Hot Rod 56 Chevy. Took it easy up the block to test, and the dam thing didn't want to stop. Had to scrape the curb hard as I turned the corner. BUT, I did drive it back home very slowly because there was a TINY bit of break left. When I got home I pull into the driveway and there on the green grass sits 2 beautiful newly painted rear brake Drums