Had an unusual problem with my Mazda gearbox (fitted in the years 2012 onwards ) while being serviced at Williams. There is a rubber plug in the side of the gearbox housing which is a blank on the 4/4, but provides a cable entry on the plus 4.
This plug had somehow worked it's way in and made an alarming noise as it rubbed against the rotating flywheel/clutch.
Luckily Tony at Williams identified the problem straight away. Williams were able to refit the plug by reversing it, but I needed to get a replacement and found this very helpful and knowledgable company who were able to post out a replacement straight away.
Thanks to them and William's for sorting this out for me. https://www.mx5parts.co.uk/clutch-release-fork-dust-boot-mk1-25-p-880.html