Can anyone tell me if you have tried a Singer 306 in a treadle? I know the 206, 306, and 319 are all from the same Singer line and Singer's first attempts at a machine that zig zags, but what else can you tell me about them? What are the differences? I think they all take a 206X13 needle and have the same 'L' bobbin, probably the same little flat cams? Anyone know about the 306 or 206? As you all know, I have the 319w and I love it in a treadle! I have a friend who wants to know if the 306 will go easily into a treadle and how different is the 306 from the 319?