Once you get your tb off, it's really pretty self explanitory. You can see that there's an hourglass shape on one side that you want to get rid of because the inside necks way down. But if you just go to grinding on the inside, you'll break thru to the outside, and that would not be good. So the epoxy works as backup material, so when you do break thru, it's not to the outside world, just into the epoxy. I used plastic "welding" epoxy that you can find at autozone, because it etches itself into the existing plastic. Last thing you want is your epoxy falling away and leaving that hole open. Since doing this mod, I've gone to the fc tb and it's still a night and day difference. hehe. But yeah, for $8 and a few hrs work, it's a great mod. Good luck, it's a lot easier than it appears. Later doods
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