For the Lexus LS, the Tahara plant developed new molds and enhanced assembly techniques[64][65] and instituted measures aimed at increasing the precision of the sedan's fit and finish.[66] The 1989 LS 400 became the first production automobile to receive extensive laser welding,[64][67] allowing for seamless steel welds.[65] A large sheet metal press was developed to reduce or eliminate panel gaps by stamping large sections whole instead of singly.[65] Separately installed parts, such as exterior lights, were also spring-loaded for a tighter fit.[67] On the LS 400, engineers reduced door panel gaps in half versus Toyota-brand vehicles, from 7 to 4 mm (0.28 to 0.16 in),[65] with measurements made within 0.01 mm (0.00039 in);[68] on the LS 430, measurement margins were increased tenfold, to 0.001 mm (3.9×10−5 in).[68][69] When production switched to the LS 460, the number of laser welds was doubled.[70]