You can buy/borrow 6mm allen keys with longer handles. Then either position it so that you can grab the allen key and squeeze it towards the crank (remembering reverse threading on LH pedal), or position it so that you can stand/stamp on it. Should do the trick.
You can buy/borrow 6mm allen keys with longer handles. Then either position it so that you can grab the allen key and squeeze it towards the crank (remembering reverse threading on LH pedal), or position it so that you can stand/stamp on it. Should do the trick.