For the Lexus LS, the Tahara plant developed new molds and enhanced assembly techniques and instituted measures aimed at increasing the precision of the sedan's fit and finish. The 1989 LS 400 became the first production automobile to receive extensive laser welding, allowing for seamless steel welds. A large sheet metal press was developed to reduce or eliminate panel gaps by stamping large sections whole instead of singly. Separately installed parts, such as exterior lights, were also spring-loaded for a tighter fit. On the LS 400, engineers reduced door panel gaps in half versus Toyota-brand vehicles, from , with measurements made within ; on the LS 430, measurement margins were increased tenfold, to . When production switched to the LS 460, the number of laser welds was doubled.