HU John,
thanks for your reply. Tried ringing Simon but no good and the facebook page is from 2018.
I emailed Sumore almost 2 weeks ago but not getting any response there either. I need a new hi/lo gear, printed one in nylon but they don't last too long. (Getting to be an expert at stripping it down )
The original appears to a nylon / resin mix. Tried a gear for a WM16 but they are smaller.