Need help with my K1

I have a major issue with my K1 toolhead. I was attempting to print a hobby clamp and, after watching the raft layer print, I walked away from the machine. When I returned about an hour later there was a massive blob attached to the hot end. It was so bad that it melted the wire from the hot end. My issue is this, I have disassembled almost all of the print head but in trying to get the heat sink out, I stripped the bolt. Is it possible to find a way to get this bolt out? My 2nd question is if anyone knows if Creality supplys the entire tool head assembly to replace? I have only had this machine 3 months and love the way it prints. Any help would be appreciated. Thanks.