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SWINGING WINDOWS SASH AND FRAME 23. On units with dual arm Roto gear, crank open the extension arm until the nylon roller is positioned under the arrow on the sash track. 24. Center the roller under the opening and pull up into the track. Turn the crank to engage the roller fully into the track and check for proper sash operation. See illustration 16. Operator sash Long extension arm Operator track 16 11/2004 4.2.17 Marvin Service Manual 11708609
