The German brass points are either screw on or glue on. I'm assuming you have the latter and that you're using wood arrows. Before mounting, scratch up the inside of the points with a sharp nail or piece of steel. Then use hot melt glue as normal. Be sure your wood tapers aren't full of paint or other finish. Raw wood is best, and if you use a sander to cut your tapers, use fairly heavy grit paper, like 50 or 60 or so. That will leave the wood rough for better adhesion of the hot melt.