Leveling a riding mower deck is probably the critical step missed by many. In this video Doc shows you some tips on how to level you riding mower deck not only side to side but also front to back. See how leveling a mower deck can REALLY make a difference. Doc levels the deck of his John Deere with 3 blocks which are just 2x4s . Use whatever works for you.
Leveling a riding mower deck.
Here is the blade measuring gauge………………
The girls after cutting with a level deck.