I just finished building two new extractors.
One is a thirty frame parallel radial extractor
and the other is a twenty frame radial.
Both are made of plywood and from readily available
hardware store items.  The 30 frame costed me about $125
and the twenty frame about $60.   The problem I have is I suck
when it comes to drawing.  I just make stupid little picture
and notes.   I would like to have some one draw them up and
post them on the internet.  I have a friend who has his own
home page and said he would post them for free.
Any one interested in drawing them up?
 
Dave Verville