Im trying to change the head on my Ryobi 875r gas trimmer to a brush/heavy grass head but haven't had any luck on trying to figure out how to remove the outer spool so i can expose the shaft so i can put the new head on. I know there should be a hole in the nut above the outer spool (see pic) that would hold the shaft so i could just screw it off but i cant find the hole! Please help with any advice. Thanks!
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Ryobi 875r outer spool