After about 3 years of _cursing_ my Ryobi weed whacker - - for its dumb frustrating auto-line-feed design -
- and after trying several DIY < failed > attempts to disable / modify it .. Viola ! < finally > youtube provided a fix.
After the fix - I did about 20 minutes of trimming and used ~ 3/4 inch of line - the auto-line-feed would have eaten a few feet of line ! Otherwise a decent home-owner tool - the batteries match my drill-driver < the reason I bought Ryobi >
Happy whacking off - weeds that is. John T.