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The use of other bow guides with a STIHL powerhead can be hazardous to the operator due to the absence of safety guards and spurs and necessary unauthorized modifications needed to mount the bow guide to the STIHL powerhead. Do not use a STIHL bow guide on any powerhead except a STIHL powerhead. Unauthorized combinations are dangerous. Warning! Never attempt to operate a chain saw equipped with a bow guide unless the spurs and both guards are in place (ill. 13). Under no circumstances should