2004 SR Johnson 2 Stroke 9.9, 15, 25, 30 HP Outboards Service Manual, Page 288Get this manual
GEARCASE ASSEMBLY2530 Insert one detent ball, then the spring, then the other detent ballPush down on the ball and slide the tool back until you feel the ball slip into the detentRemove detent toolSlide the reverse gear down the propeller shaft and into the gearcase
1Reverse gear 2Bushing 1Detent ball
COB3051
Install the propeller shaft and detent tool in gearcaseMake sure the following occurs: Propeller shaft must engage forward bearing Tool ramps must engage clutch dog ramps Hold tool firmly against clutch dog Gently tap propeller shaft with rawhide mallet to seat detent assembly