I have a CS30 Ryobi Piece of S***. The SECRET to fixing the rope pull is a 9/64 long reach ALLEN Wrench (Key). Remove all screws that hold the plastic housing on both front and back.
Look in the back at the piston connecting arm, insert a piece of wood against the arm so the shaft won't turn when you try to unscrew the ALLEN Screw which is located inside DRUM CONNECTOR #33 on this print.
http://www.ryobitools.com/product_manual/file_url/307/RY30000_401_r_sheet.pdf After that you are on your own but that's how you get to the rope pull. What I did was as above but I kept the 9/64 ALLEN Screw and threw the Ryobi in the trash were it belongs. DO NOT BUY THESE PRODUCTS, THEY ARE CRAP.
MIKE H. FLA., October 2010