It went BANG !!

Found this amongst all the rubbish on my work bench the other day. It's one of the original coils from my 1100Sport based project (the Single seater)
    When I was sorting out the wiring I thought I was being very clever leaving on the original coils. I had replaced the 1100motor with a Spada III item using points and condensers. A few weeks previous to the day of the bang I thought one coil in particular seemed to be getting hot very quickly along with some crackling noises. It was one hell of a bang as you can probably gather from the photo. 

A lesson learnt anyway that you can't mix  the later type coils with early points ignition.