The forearms, along with the biceps, shins and thighs were all assembled by butting the two halves of the armour pieces together and gluing a joining strip over the seams. The width of the strips varies, and I use 15mm for the arms, 20mm for the legs and 25mm for the backs of the shins. The backs of the shins only had the strip glued to the outer half so that the actors could open them up to get their feet through.