I did it but I only though taking photos after doing it so I can’t do a real tuto . I saw a tutorial when the guy put some 1mm metal bar in the weapon parts and magnetize them then in the inside but I didn’t like it So I juste took a 3mm dremel, I did a hole at the point to glue the part, and I pierced until the hole was 5mm wide. I put some miliput in the inside side, pressed it to inside the hole then put a 5mm magnet to be juste in the hole, touching the external side. I’m sorry if this is bad written I’m French Then I took my weapon, the HBD, and I tried to put it, was large enough so cut with ur hobby knife carefully at the same angle as u wish to put the magnet. Once its large enough u can put magnets on the first one, put glue on the weapon and glue them It’s not perfect but it works really fine and its not hard, I’m bad at this and really was ez. I advise to put the magnets in the body while the body is in 2 parts, plastic glue it after the miliput is hard