This part kinda fell out early in the process of disassembly. Looks kind of like a grounding strap, but not like the one in my book. Does this look stock for my bike and how does it actually attach? CA78 from 1963 http://farm6.static.flickr.com/5053/5396370302_94f26fbff8_z.jpg unknown part by nestwoodmotors , on Flickr