Replaced the self-drive transmission on a Honda HRX217DA lawn mower. This was a relatively difficult job getting access to the old transmission. Make careful note of the washers and bearings on each side of the drive axle for reassembly in the correct order. Make careful note of the drive axle wheel gears on each side that MUST be installed so that the cam keyway engages properly. When each gear is removed, mark the inside and right or left so that it is installed correctly. Remove the spring and cam key from the old axle and install on the new axle.