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AFTER RIVETING IN THE FRONT TRUNNION YOU MUST PUSH THE BARREL IN BY PUSHING AGAINST THE FRONT TRUNNION,NOT THE SHEET METAL RECEIVER.THIS TOOL IS STURDY AND PLENTY STRONG. IT STRADDLES YOUR PRESS PLATES OR BARS. IT SUPPORTS THE FRONT TRUNNION AT THREE SOLID POINTS. THIS TOOL ADJUSTS TO MEET THESE POINTS ALLOWING YOU PRESS YOUR BARREL STRAIGHT DOWN INTO THE LEVELED TRUNNION,NOT ALL TRUNNIONS ARE THE SAME SO THIS ADJUSTMENT IS IMPORTANT.INCLUDED IS THE T-SHAPED SUPPORT PLATE TWO SOCKET HEAD CAP SCREWS AND TWO SUPPORT/JAM NUTS.IF YOU ARE DOING A PSL LET ME KNOW AND I WILL SEND YOU ONE RELIEVED FOR THE STEP IN ITS RAIL,OR YOU CAN DO IT YOURSELF WITH A DREMEL OR SMALL FILE.standard akm rivet shaft diameter.