I needed to replace the Harman TL300 combustion chamber so I ordered a new one, and today I decided to install it. My problem is when I set it in place it sticks out of the back of the stove about a quarter of an inch. My question is do I need to just put the back plate on and slowly tighten all the bolts down to squish the gasket? I am afraid to break the fragile body of the combustion chamber. Or do is there another problem that I need to adress? I called the harman dealer where I got the stove and they had no idea, they have never replaced one before. I called the online store (woodmanspartsplus.com) where I bought the combustion chamber and they do not have a tech department, they just sell parts. Please help i need to get my stove up and running.