My 3- year old Buff Orp rooster's spurs have grown so long he is having trouble walking...plus I'm concerned that he could damage the hens. The book says you can coat the spur in oil and twist off the old covering to expose the new spur. It also mentions the alternative of simply clipping the end off each spur and filing it smooth...but cautions against trimming off "too much" and causing bleeding. How much is "too much"? Anyone out there have experience with spur trimming?