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Can't extend/trim surface... (Newbie)

Question asked by 1-VQHTJE on Jan 17, 2011
Latest reply on Jan 20, 2011 by Jerry Steiger

My problem is that I was given the attached file to modify.  It is a thread adapter, so I need to change the threading on both ends (diameter, pitch, ...).  It was modeled as a surface so my first thought was to turn it into a part (in a previous post someone helped me achieve this).  I became interested in surfacing, so I completed some tutorials.  However, things are straight forward when starting from scratch, but with the file attached I am not sure how to modify it, for example, trying to extend a face gives me the error "There is no extend boundary", for which Google has no answer.  Any hints would be much appreciated!