I am really very impressed by the speed this single item order was handled by Multplx.
The J-Plug (with loop) and the Tetrakey Security Tool (needed to actually lock/unlock the J-Plug from the 3.5 audio jack) arrived in less than 24 hours (UK to Germany).
Called me twice from the UK to Germany to handle my inquiry and the order itself. The people at Multplx really did a great customer service job for my tiny, tiny one item order. I assume that the J-Plug was initially made for lage scale use to prevent demo devices from theft (e.g.: exhibitions, large sales stores, etc.). I have ordered the J-Plug directly with the manufacturer in the UK as there are basically no stores/distributors in the EU yet. I have found a very good solution for laptops or ultrabooks that do not have a Kensington type of locking slot anymore: