I am in the process of replacing the bushings on the gearbox of my 1993 Plus 8. Whilst I have the gearbox exposed I thought it would be good opportunity to also change the gearbox fluid. Can anyone point me in the direction of how best to do this? Links to photos below.

https://flic.kr/p/2pec3cp
https://flic.kr/p/2pegtdc
https://flic.kr/p/2pehHzi

Thanks for your help.
David


Morgan Plus 8, 1993.