Triple- and quadruple-stacking weapons. Using the side connection points of extenders, it is possible to stack two razor tips or iron spikes in the same spot. Do this once or twice to get a weapon setup that appears to be two weapons, but is actually 3 or 4. This type of stack has a very high damage output given that the stacked spikes are guaranteed to all hit simultaneously.To do it, first attach two 20cm extenders parallel to each other using the side attach points. Then attach a third extender on the other side attach point of the first one and rotate it so it overlaps the second extender. It will look like two extenders, but it's actually three and you will be able to attach three spikes with a little patience.Quadruple-stacking is a little harder. You need to attach a fourth extender on top of the second or third extender so it overlaps the first one. It will be harder to attach the weapons, and the 7 parts in a row limit will start interfering at this point, but it is possible. In theory, quintuple-stacking is also possible, but getting the spikes to overlap would be a nightmare (unless you combine this technique with the eFFe glitch, described below).