DOP32400 Stihl TS400 Concrete Saw Clutch Drum Pulley No. 4223-700-2500. When replacing your clutch on your saw it's best to go ahead and replace the drum pulley to get the most out of your clutch. This drum pulley fits the Stihl TS400 concrete saws and replaces Stihl part number 4223-700-2500.