The piece that joins the lower and upper tube of the Ikea Lersta lamp. For the case that this thing got lost when moving. Note, however, that the part is definitely not strong enough in plastic alone, so it needs a 6 mm bolt through it for reinforcement. There is not really enough room for the nut, so the nut needs to be rounded (in a lathe if you have one) to fit.Make with thick walls and much infill, for strength. I used 1.4 mm and 60%, but 100% infill is probably better. For reinforcement, you need a steel bolt and nut through the body. You need to cut the threads for that.