In this paper we present a novel apparatus for simulating real world primary tasks typically found in wearable computing. Additionally, we report on a preliminary interruption study using the new apparatus in a laboratory experiment and compare its results with previous work to show its applicability for research in human-computer interaction for wearable computers. Keywords Wearable computing, primary task simulation, interruption study, HotWire experiment ACM Classification Keywords H.5.2 [Information Interfaces and Presentation]: User Interfaces--Evaluation/methodology, Interaction