BCRacing coilovers MINIMUM amount of thread for bottom housing when raising car?
 

I have the BCRacing BR coilovers. Trying to raise the car, what is the minimum amount of thread you have to leave in the bottom part of the coilover (below the locking ring)?

I've raised it significantly where I can see right through the open inlet hole, so i don't feel like its safe. I have about 1'' left of thread measuring from locking ring to bottomost of the inner threaded housing.

Attachment 164113

Attachment 164114