Hello - I've only been riding for just under a year and have never before had any problems with my bike - so I don't have any experience in bike maintenance. Anyway. I haven't used my bike for a few weeks due to the cold weather and when I tried to use it this morning it wouldn't start. I got it into my head that the spark plug might need changing/cleaning. When I removed the rubber thing from the top of the spark plug, I think I may have broke something as a little piece of metal (kind of like a cup with a screw thread around the outside) and a small white thing (looks a bit like chalk) with a spring attached fell out. I'm not sure if they've snapped off or if they're supposed to be able to fall out. If I put them back into the rubber thing than I don't know what order thay go in. I'd feel really stupid calling out a mechanic and I can't afford to pay for one anyway. Can anyone offer any advice.