I have an Echo 2601 and really don't like the head very much. It seems to feed the line at the least little bump, which I figure wastes about 25% of every spool. Around here I can't find any good replacement heads, so I'd like to hear what (and where to get them) some of you guys use. Not all heads will fit on the Echo's. I've looked at the Stihl heads, but they won't fit.