Post Script
So I ordered a Knew Concepts Mk-IV fretsaw. I went back and forth between getting the Mk-III that most of you have vs the Mk-IV. I asked KC Customer Service for advice and they emphatically recommended the heavy duty Mk-IV for dovetails. It costs $6 more than the Mk-III. The Mk-IV blade swivels 360*, which I'm not sure is as big an advantage as it sounds, but we'll see. But it is also more rigid, which I like. According to Highland Woodworking, the Mk-IV weighs in at 8oz compared to the 5 oz Mk-III. So that's a lot of extra weight, relatively speaking. Guess we'll see.
I'll post a short review after I try it out.
Fred
"All that is necessary for the triumph of evil is that good men do nothing."
“If you want to know what a man's like, take a good look at how he treats his inferiors, not his equals.”