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To change the combination on the Master 175 four digit combination lock, you have to know the correct combination. While you can pick the 175 with a paper clip, you have to decode the lock. One method of decoding the lock is to "feel" the flats with a modified automotive feeler gauge, and there are plenty of videos about that on KZbin. The other method is to disassemble the lock, and directly read the combination. This video presents my method of performing lock disassembly and reassembly.