I can use various CAD programs, but since I don't use them often (too slow), I sometimes use a scale rule and a piece of paper. I find it gives a better feel for things. But I did make one goof while using one of those 3 sided scale rules: I somehow used a different scale on some part of the drawing. Every time I pick up the scale rule, I have to turn it over, looking for the right scale (It's always the last one). I propose a little plastic 3 pronged oojamadoobreything that allows the user to point a red marker to say "THIS ONE, STUPID".-- Ling, Nov 01 2004 I need it.-- swamilad, Nov 01 2004 my aunt lives in the remote outback town of oojamadoobrey.-- benfrost, Nov 01 2004 Do they make three pronged thingys?-- Ling, Nov 01 2004 The Green Manalishi had one.-- angel, Nov 01 2004 The Green Manalishi had one missing.-- Ling, Nov 01 2004 So he did! What *was* I thinking?-- angel, Nov 01 2004 random, halfbakery