cylinder repair

Bought a used Stihl 462c from guy claimed it wasn't sparking, sparked just fine, thought it was fuel problem, PLENTY of fuel getting to cylinder (EXCESSIVE flooding), took the head off and find this carnage!!! first question is where did that piece of metal come from? all bearing pins are...

So it's my first time trying to resurrect a chainsaw. Bought this fairly new MS170 off a guy that had straight gas ran in it by accident, I hope the cylinder is reusable because I'm not really looking to pay a lot for the parts. I'll use it for parts in that case. The pics are here: From the...

I get asked from time to time about the tools I use to revive scored cylinders. I've cleaned a lot of them now and have had a fair amount of success. When I'm at home I use the flex motor and a mandrel, but occasionally I'll bring one in to work to do on break. I've used a split mandrel in...