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Leveling is one of the most important calibration steps and may need to be done from time to time.
The Leveling instruction for PDMS can be found here: http://wiki.peopoly.net/doku.php?id=moai:leveling&s=leveling
The steps here are for PDMS vat with standard plate, for easy-to-level plate, use this leveling guide
Resetting level. You do not need to do this most of time, best to follow the above instruction
Helpful videos: leveling - the entire process https://youtu.be/gHHqfrhKt7M?t=5m58s
leveling - nuts tightening https://youtu.be/gHHqfrhKt7M?t=8m49s