To clear the backlash apply thumb pressure to the line on the spool. Next disengage the spool. With your free hand pull line off the reel. When you get resistance pull a little harder. If you can't pull anymore line, reel in about a foot of line. Then disengage the reel again and continue. Depending on how bad the backlash is you may have to repeat the process of pulling and reeling in a few times.