My glass doesn't fit snug on the top? Mason February 02, 2017 00:46 Follow Add a extra o-ring to the ceramic top to fill the small gap between the ceramic and the glass. Related articles Thunderbox Pro Manual Bolt M Manual How do I change the heating rod? My nail has broken off inside the ceramic top leaving the threads stuck inside? What is the best heat setting for the Bolt M? Comments 0 comments Please sign in to leave a comment.