jopasm

Two other things - are you getting much air out of the blower?  Insects (dirt daubers, spiders, etc) love to build nests in the outlet pipe.  Also, does the ash dump seal reasonably well?  The small forge I use sometimes has a round cover that pivots over the bottom of the ash dump and has a spring to hold it tight against the pipe.  The spring is worn, so I had to make a wedge, otherwise most of the air was going straight out the ash dump instead of up into the fire.  

Is it this episode?  "Iron Work for Timber Work", still available for streaming on PBS. 

http://video.pbs.org/video/2178676894/