The washers are pathetic if i remembered. Depends on which part is leaking from redsaw, did you take the main handle off?
Pop the cover cap (T logo) off with a small flat head screwdriver
Need a phillips to unscrew the main handle
Wiggle the main handle off
Your at the guts of the shower now, off the top of my head theres a grey cap i think thats has different washers/U Clips thats holding the parts of the shower together.
They are quite easy to figure out how they work mate, even without instructions
Its leaking from the handle?
Could be a few things, some of the U Clips might not be fully pushed in place, some of the washers might be faulty.
Case of investigation fella, did you get the main handle off?
Did you fix it?