 Beckman was not allowed to tell his staff the reason behind the redesign, and they were not particularly interested in the problem; he eventually came up with a solution himself.Instead of using a wire wrapped around a coil, with pressure from a small spring to create a single contact point, he redesigned the knob to have a continuous groove, in which the contact point was contained.The contact point could then move smoothly and continuously, and could not be jarred out of contact.