I had some misfire problems as well and had to take the bolt apart completely to clean packing grease off of it. Took a minute to figure out how to do it since T/C doesn't include the instructions in the manual or give u the tool to do so. So, I just made an Instructable on how to disassemble the bolt completely. Follow this link:
http://www.instructables.com/id/How-...-Ven/?ALLSTEPS