WARNINGS:
The ER's have an external resivior and these need to be loosened before doing any height adjustments.
Also make sure the sway bars are disconnected.
Also make sure your tyres are at their hot temp
Preload (front)
1. Leaving the lower locking collar alone, unwind the spring by turning the top 2 collars so that the spring is no longer touching the top perch.
2. HAND wind the spring back up until you can turn no more (with the top ring).
3. Wind the other (smaller) collar spring up (not the one at the bottom) until it touches the upper collar.
4. Wind the upper spring up (with a C Spanner) until it is 3mm above the smaller collar. It just so happens that the BC Racing C spanners are 3mm.
5. Wind the smaller collar up and lock the 2 rings together and then measure the distance for future reference.
Preload Rear, same as for the front
Rinse and repeat for the other side.
Make sure you mark the 2 upper rings (I used liquid paper) so that you can use this later and see if things have moved.
Corner Weighting.
The plan this time was to set the front ride height at the pinch welds of 100mm F and then adjust the rear height when corner weighting.
Because I do not have drive on ramps for the scales it takes a few hours to set the scales up. But once I mark the ground it is easy to put them back.
I use a laser to know the height from the scale pads (these are old photos). Once I know the height off the pads I can just read off the laser mark on the tape.
As is written make small adjustments and note the changes. With driver, 1/4 tank etc it was LF 115mm, RF 119mm, LR 109, RR 108. (without driver LF 116mm, RF 127mm, LR 111mm, RR 127mm)
After the first change I noted that i full turn raised/lowered the car at the front 2mm. After 2 adjustments (front only) I got LF 101mm, RF 104mm, LR 106, RR 113mm. the LR/RF was 51.33%.
Now to corner weight. The target was 50.2% so I needed to drop the RF 7kg so this equated to 2 full turns (which would also lower the RF. After this adjustment I got 50.44%

Final numbers:
Target
Actual
Compare
The file I used to track adjustments etc is attached. Don't forget to do the sway bars back up as well as tighten everything that you loosened back up as wellas torque the wheel nuts and let the tyres down. Take it for a test run and then (as I had to do) make adjustments. Provided you make the same adjustments to each side the corner weight will stay the same and all you do is raise the car.
High res photos are here https://plus.google.com/photos/115769813738304087848/albums/5904127951028007025