Unfortunately as the doughnut is still under pressure removing the top suspension arm is not possible as the donut needs to be compressed first and I am unable to do that, for the reasons stated.
With chocks under the footwell and secure supports under the front cross piece of the subframe, lift the body away. This makes it much easier to drive out the Top Arm pivot shaft............................................
Seriously. Before compression tools became widely available, removing the shaft was the only way to extract the trumpet and doughnut, and often, the most difficult obstacle was first releasing the taper on the top Ball Joint and disconnecting the Swivel Hub.
Fortunately, as you have worked on it, the area should be fairly clean. Disconnect the Damper, and as Spider explained, by removing the little Philips head screw that holds rebound rubber between the subframe and the underside of the Top Arm, dislodge the rubber and extract it.
The shaft is going to come out towards the front of the car, so clean the shaft threads at the other end and slacken the nut until it is almost half off the end of the thread. Lubricate the exposed thread as it helps to reduce damage.
Ignore the nut at the other end, it fastens the shaft to an oval plate which is held in place by two small hex head set screws which have to be removed.
With difficulty, drive the shaft out far enough to get a screwdriver blade between the oval plate and the subframe, by carefully hitting the loosened rear nut. Remove the rear nut, this deters the temptation to hit that end of the shaft.
Keep levering the oval plate away from the subframe, moving from screwdriver through chisel to tyre leaver etc:, and once the exposed thread at the rear has cleared the subframe, the shaft can be pulled out with your left hand as you hold the Top Arm.
Please forgive me, if all this is "Teaching Grandmother to suck eggs"
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