I was only able to use my woodstove for a few months before the cap got plugged.  I was getting my stove cleaned 2 or 3 times a year.  I tried a few different sweeps for cleanings and tried different caps.  A coworker of mine recommended Sid.  Sid explained that I wasn’t letting the chimney get hot enough before I choked down the air.  All those caps and extra cleanings was money wasted.  I wish I would have called Sid right from the start.