I got that kill switch done, and I'm more than pleased with it. I found under one of the head bolts the old snapped kill switch and worked out it's 12mm wide so I found an old offcut from some guttering I had in the shed and cut 12mm off the end. I bent it to the height of the spark plug and rounded off the ends using the old snapped metal as a templet and it springs back perfect. I sanded back the ends that need to make contact to ground with the spark plug and the head bolt as it was colourbond taped them up and painted the rest.
Last thing left is the baffle inside the muffler, the materials arrived today to make it so I will post that when I get that done. Hoping my idea works as I have no idea how the original even looks, just going off the SB parts diagram uploaded to this site and some images on Google from car exhaust.
