I think that you will find that the little round chamber on the end is in fact an expansion chamber and that the small holebolt is for the final filling of the damper when it is fitted to the car. A small plastic syringe is ideal for the final top up as this allows you to over fill the damper. With the car on a leval surface let the excess oil drip out of the small hole and then seal with the small bolt. If the expansion chamber is overfilled, there is the possibility of hot oil being forced passed the seals on the lever spindles. .

Some of the odd size fittings on my 1958 Sprite have turned out to be Whitworth sizes. Sometimes I could get Imperial/NF/NC-SAE wrenches to fit, and occasionally a metric would fit. A couple of them required a Crescent (adjustable) wrench/spanner or a Whitworth wrench/socket to get them off.

The over-understeer is dictated by the front roll stiffness vs the rear. I went to 400lbs front spring, with the 11/16" (IIRC) anti roll bar, with some shortened Mondeo drop links, the front shocks were new lever arm with uprated valves and thicker oil. On the rear i made up custom 6 leaf (stiffer) springs with just the thicker damper oil. Even this set up is quite soft TBH. I also lowered the suspension a little all round. The rear spings would wind up on a launch causing the prop shaft to hit the tunnel. I also ran the taller of the two difs permitted, because i drove to the circuits.

Its a good upgrade. When i replaced my oil, i was amazed at the difference. I might do the same with my Morris Minor but i'll see how it goes first

See the answer from tony, do not fill up the expension chamber

My favourite part is the squealchy noise.

Don’t mess with the oil viscosity! Do the research, as many say heavy oil can hurt the internal structure of the shock. Change the valve instead. Or change the parts in the valve that determines how stiff the shock is. I got new valves from moss motors

What does it look like to rebuild one of these, just replace the o-rings and springs?

Very interesting video, (the gearbox overhaul was great too!) Any idea where these shims would be available?

Hi where did you get the oil for these. ?? Thanks