I bought a 500K linear taper pot from Frye's electronics.  This evening I thought I would christen my new soldering station and do the little glob on the back of a few of my pots and the first pot I grabbed was the one from Frye"s.  This pot is from NTE Electronics and I could not get solder to stick to the back of this pot and I got it hot enough to melt the solder.  My first thought was that it was me and then I grabbed a pot I bought from Gitty and did exactly the same things and in a much shorter time the pot got hot enough to melt the solder and produced a nice looking spot to use as a common grounding point.  I went back to the pot from Frye's and still no cigar.  I cleaned it with sandpaper both times and never touched it with my fingers.  I have another reason to not like Frye's.