I bought a T25 from a guy for 120 shipped. I knew it was going to need some work, I'm starting by replacing the wastegate. It has some shaft play, and there are some marks where the fins hit the housing. It was recently rebuilt, so I'm not sure if the marks were from before the rebuild, or after. It doesnt seem to be touching now. My question is, how much shaft play is acceptable? And if its too much, what needs to be replaced to fix it? Another question: cooling. Do I need to run coolant/water through this as well? If so where should it come from? Any help is appreciated.. thanks..