Oregon 310-120 Original Instruction Manual page 16

Preparing for Use
Grinding Wheel Dressing
Wear personal protection equipment
Start the grinder by turning the switch to position "I"
Profile the grinding wheel with the dressing
brick (E), always working with extreme caution,
holding it with two hands firmly and effectively
WARNING Contact with the grinding
wheel while it spins at high speed may
cause burning and abrasions
Stop the grinder by turning the switch to position "O"
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Check if the grinding wheel (C) profile is correct
using the template (D) Continue to dress
wheel until profile matches template
310-120