Just WTF is this thing? (blue circle)? the only details stamped on it top and nothing on the bottom (ripped it out now) are "100". I'm thinking it's a power choke but I can't find any of the same spec/size :S Ripped the sides off, it's got a small metal coil, that's all I can see. If I short the contacts where it used to be to see if there's any boot am I likely to cause megadamage?