its an extra bit that goes in your normal bridle to make it into a double bridle, you attach the curb bit on it, the bradoon then gets attached to your normal cheek pieces. I advise using a thicker rein for the braddon and a thinner rein for the curb.
The slip head attaches to the bradoon P_G?!?!? You cant make a double a normal snaffle bridle just by removing the sliphead and corresponding bit, therefore the sliphead MUST be the bradoon section.....