I cracked mine open when it broke but didn't do anything further. I've rebuilt a few T5s about 10yrs ago. You'll need some snap ring pliers, basic hand tools, a gear puller but a press makes life easier, and some common sense. Basically my advice is to go slow, take pictures and walk yourself through it. It's been way to long for me to walk you through it, but it's not hard at all. most of it is self explanatory.