GTS owners - what tool/trick do you use to lower rear for track use

[stevehifi]

Hi Guys,

As you know the rear spring perch is adjustable but unless you remove both the shock bolt and one of the camber arm bolts (165Nm) and drop the whole arm
to remove/adjust the spring perch... the only option really is to buy the BMW tool (335010) to compress the spring in order to adjust the perch.

I was wondering if anyone found a trick that is easier or more cost effective since the spring compression tool is expensive ($600). I want a relatively easy solution to adjust from street to track height in the back.

Thanks,
Steve