That is possible but if he has already tried the brass slot is probably buggered a bit making it even more difficult. I advised removing the carbs to prevent making it so bad it wouldn't come out at all. In my case I had to remove mine because the brass slot did indeed give way making it impossible to do on the bike.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!