There should be a hex head set screw in ther center of the motor plate (on the bottom of the grip) and a flat round disc on the inside that sits between the bottom of the motor and the plate. If that screw is missing, you need to find a replacement as that is the only adjustment for the motor height,and if the disc is missing,you need to replace that as well as the set screw will sit on the main shaft of the motor and eventually damage it. Don't keep pulling the trigger while it's sitting too low as you are grinding the motor and bevel gear into dust.
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