Hi
i had the same problem with the bolt turning from the outside. Looking inside and it had detached from the coil cables. In fact the coil cables had separated. I refitted the bolt making sure it didnt touch the casing using rubber washers and a grommet. I then soldered the cable to the bolt head. So far all is good, it works a treat.
The pic show the state "before" - unfortunately i forgot to take a pic of the fixed item, i'd got it all reassembled before i realised i hadnt taken a pic - d'oh! [ Guests cannot view attachments ]