Easiest and most effective way to hold the weights in place, whether shot, fishing weights, lead strip or old bolts, is to mould 'Plasticine' ( kid's synthetic, 'plastic', modelling clay) around them, in the nose area. This not only ensures the weights are held in place without fuss or mess, but the 'Plasticine' itself also adds weight. It also eliminates any possibility of too much adhesive, resin or other 'sticky stuff' damaging or melting the plastic from the inside.