I've read a lot of posts about baffle replacement but I haven't seen anything addressing my problem - sliding the secondary tubes to the left!! Have Hearthstone's instructions and watched their video describing a number of other models. I've removed the cotter pin from the middle tube but there's absolutely no play in the tubes allowing them to slide. Is this just too many years of burning and accumulation of ash and grit? Need to use more muscle to break things free? Any tricks on getting the tubes to slide out would be appreciated!