This paper proposes an unusual approach to the development of a musical performance setup through an iterative process which seeks to enhance the errors, faults and shortcomings of the system rather than refine, improve or fine tune them. This particular instrument design approach works in parallel with a performance practice centered on live construction of new music, refinement of a groove and the creative process of troubleshooting. In my practice I use an extended turntable system, developing new electro-mechanical interfaces between a record player and various other devices. The paper describes my approach to developing the Mechanical Techno project, using the system in live musicking contexts and making iterations of the setup. The aesthetic aims of the project are defined in order to highlight the types of mechanical and electronic errors and flaws which are important to its success. Several specific examples are given by way of illustration, demonstrating how physical wobbles, imprecise triggering and out-of-sync mechanisms can lead to interesting and idiosyncratic elements in live performances and recorded compositions. The approach is summarised as a process of 'ironing in the creases': recognising the system's problems and – counterintuitively – deliberately emphasising them.