Robert Stephen Morton
Tobes. come on, 30 years ago we used to screw a screw into the level at 2ft so that we could adjust the fall, the screw also acted as a indicator of a lip or gap when the level was pushed over the joint then we used to swab the pipe of loose cement. today we use lasers to guarantee fall. Do they have lasers in Western Australia? & what about PVC pipe?
Regards Bob 
