![Very Happy :D](./images/smilies/biggrin.gif)
Couldn't have made it it any worse and now I have teeth from notch 3 to around 7! Used a 9mm flat burrer with extension and was able to get in and 'make' new teeth at the correct angle for the ratchet to work and hold firm again. Cost £32 for the bit and took around 20 minutes, including retrieving any shavings from the recess with a magnet.
Tested and working as it should do so happy days!