I want to readjust the height of my ohlins whilst my cars off the road. This particular type I heard you need to take the entire thing off the car and adjust the bottom perches so can someone explain how you go about doing this?

I've attached a picture of the set I'm running.

 

Sounds about right. The spring perches look similar to the Konis.

To adjust ride height, you would need to get a spring compressor, compress the
spring, remove the upper shock bushing/mount, move the spring perch to the setting you want and put everything back together.

 

you can see the grooves in the shock body, there is a big c-clip that fits in one groove at a time, depending on whta groove it is in will locate your spring perch and ride height.

just like konis.
just bhe careful to NOT bend or break the c-clip as you open it just a tiny bit to relocate it to a different groove, ask me how I know.
doh!
2 new clips from koni, next day air, wtf!

 

Also be sure to install a helper spring if your springs are loose when the shocks are fully extended in the new setting you want.

http://performanceshock.com/index.ph...roducts_id=452

 

Ok so if I move the the perch down this would make the car sit higher?

Also whats the best way to make both sides level? As currently my left side is about 10mm lower than the right side yet I measured the height of the perches before the install and they were even.

 

if u move the perch lower, it will lower the car. This isn't a coilover, so left and right side isn't too hard to measure. just make sure the perch are sitting on the same lvl both sides