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3. Remove depth gauge tool. With flat file, round off front corner of cutter depth gauge (see Figure 22). After several hand filings, have authorized service center or sharpening service machine sharpen chain. This will insure even filing. Flat File Depth Gauge Slot Depth Gauge Tool Depth Gauge Figure 21 - Depth Gauge Tool On Chain Front Corner .025" Figure 22 - Round Off Front Corner Of Depth Gauge REPLACING SAW CHAIN Replace chain when cutters are too worn to sharpen or when chain breaks. Only