Adjust the knife height:
Method 1: Use one spanner, to tighten the nut 1, then loosen the nut 3, after that, you can adjust the nut 3. Then you can adjust the knife height. At last you should loose the nut1,
then tighten the nut3.
Method 2: use 2 spanners. One to immobilize the nut 2, the other spanner to looser the
nut 3, then ,you adjust the nut2. At last loose the nut1, tighten the nut3.
