Hi Thierry,
If you decide to change your shock absorbers, I recommend to go to "AVO Rutherford" , unfortunately marketed by very few sellers. They are the only ones build especially for Morgan, and they are adjusted with a small wheel on the side of the shock absorber. You have 10 clicks to set the hardness, but nothing to remove, no tool, just pass the hand and turn the wheel to adjust, so you can do that on the road very easily.
Good luck.
BR.
Daniel.