Look at the underneath side of the knob. Many of these have a square molded into the knob that fits over the square shaped adjusting stem coming out of the regulator. The replacement regulator (if you end up having to replace it) is part #885807 (reference number 30) and is $42.88 Here is the link to the parts breakdown.
http://www.toolpartsdirect.com/cgi-bin/schematic.cgi/hitachi/EC119SA
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