This was a fun one, made from an unknown year/model BMW. Several test arrangements of the gears and a quick lesson on "negative space" from Roo, I set out to put this together. After what I considered to be successful welds, I set it down heavy handedly on the workbench. The welds did not hold. I had to clean all of the parts up and thanks to some twitter friends' advice, "turned up the power". The second pass was successful.