Vertical chases are done from top to bottom. Right hand should hold on to rear handle and switch while the left hand firmly grips on the milling cutter cover.
Left hand guides the chaser machine bearing most of the force. Once the cutter has entered the wall, pull down MACROZA wall chaser with both hands thus producing a straight vertical cut.
It is very important the machine is being held in the right position as shown on the pictures below.
To open oblique or diagonal chases we will proceed in a similar way.