Dogleg, or Jenny, calipers are used for marking a line parallel to an edge;
Although they are very useful I find them to be rather crude for fine work, mainly because of the lack of fine adjustment. So, I took my Staedtler compass, bought in my schooldays, and replaced one point/lead with a short length of brass turned down to fit (I needed 2mm but had none). One end was turned down to provide a shoulder to sit against the edge of the workpiece;
This means that I now have a Jenny with fine adjustment and a sharp point, perfect for marking out brass and styrene.
You don't need a lathe for this conversion, all you need is a piece of suitable rod and a file to file a flat on one side.
Paul.
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