Hello- I recently had a wood insert installed along with a stainless steel chimney liner. The top half of the liner is rigid and then connected to a flex section which runs to the insert. The two sections were connected together by slipping the rigid inside the flex and then securing with screws. Does anyone know if this is a proper connection method? Or should the installer have used some type of adapter? Also, I was wondering about the connection of the flex section to the insert itself. I believe a 'flex adapter' was used at that point but the fit was not real tight. It was connected with screws, though. Does that sound right? Thanks for any help with these questions.