MAKE Flickr photo pool member Anachrocomputer has a clever DIY solution for the weird plugs Dell uses – “Here’s a quick fix for a friend who wants to run her laptop from a DC-DC convertor. Only trouble is, the laptop has an odd square plug and the convertor only has round plugs. An in-line adaptor made from a pen barrel solves the problem! [Pictured here] – The finished adaptor, with the socket fixed in the pen barrel with hot-melt glue. Also visible are the two plugs, one from the DC-DC convertor and the other from the Dell power unit.” – Link.