They are very easy to change. You need a 13mm spanner and some heavy duty (proper heavy duty) circlip pliers.Well convinced it was either fuel or air was my problem, took the pipe off intake off turbo and gave the shaft a wiggle, had the farmer and his son both independently had a turn and a wiggle..
Conclusion
it ain't very good
View attachment 231201
Off it came and
View attachment 231202
and this
View attachment 231203
So i reckon it is broken with an F
so best get on the internet tonight and find a video on how to change the cartridge, are there any makes i should be avoiding or someone would recommend
I bought my replacement CHRA from Fourby
https://fourby.co.uk/epages/950004277.sf/en_GB/?ObjectPath=/Shops/950004277/Products/CHRA