Drones are held together on your shoulder by long cords that are joined together at each with a tassel. The drone cords are secured in four places: outside tenor drone top to the middle tenor drone top to the middle section of the bass drone, to the top of the bass drone. The cords come in many colours and are traditionally made of wool or silk but can now be bought in polyester.
Spacing the Drones
If the spacing between each drone is too great, they will sit to far down on your shoulder and they will be too hard to balance. If the spacing is to small the weight will all be on your shoulders. Some people believe that you should leave 7" between each drone but that doesn't make sense since people are all different sizes. Therefore, stretch your hand out like the image to the left and use that spacing for your drones to be in the correct proportion to your body size.
Use a zip tie that matches the colour of your drone cords. These can be bought pretty much anywhere, try amazon or your bagpipe supply store. Just tighten them and then cut them. The great thing about using a zip tie is you can easily adjust them if they are not perfect.