Well I went ahead and purchased a Sooteater system to clean my chimney and today I decided to use it to clean the chimney. I have to clean from the bottom up as my chimney requires a 40 ft. ladder to reach (which I don't have) and you can't stand on the roof. The beginning went fine and I think I cleaned the entire chimney (about 25 ft). I got about 2 gallons of fine brown powder. I went slow when I thought I was near the top - but I think I knocked the cap loose (It is a large cap - not connected to the liner - covers both flues I have). I went outside with my binoculars and looked up at the cap and it appears that it is slightly ajar from how it normally sat on the top of the chimney bricks. My bigger concern is the liner and the block-off plate at the top of the flue that holds it in place. I can't get a good look at it and I think it may not be sitting properly on the flue. The Sooteater seemed to whip the liner a little bit inside the flue and I am nervous that at the top it whipped it a little to much and loosened the top block-off plate that holds the liner. That may have hit the cap on the side of the screen and knock it loose. I don't think I pushed up to hard and knocked it loose that way. So - I called the Sweep who installed the stove and he is coming tomorrow to check it out. Makes my a little mad because I tried to get him to come clean last fall and he blew my off. I then hired another sweep who cleaned with the Viper system - but didn't check the top as I and requested. (long story) He didn't do the job we had agreed to and I didn't end of having to pay him - so I thought since I saved that money I would buy the Sooteater and do it myself. Hopefully I didn't really screw something up. So - The oil is flowing tonight and I hope the Sweep doesn't blow me off again as I'm not going to burn until I get it checked out.