We have been made aware of an issue concerning the rotation of the mulcher drum. This issue is caused by the washer under the head of the bolts not being correctly flattened. Once these have been correctly flatted it leaves a gap that allows you to rotate the drum housing.
In order to solve this, tighten the three adjusting bolts on the drum and then loosen the three nuts until they are very loose. This should allow you to then adjust the angles and retighten at the angle you require.