Adjusting the rear shock absorber SWH with external spring, LEFT (MZA) - Simson, MZ ETZ, TS Note: Designed for SWH double adjustable shock absorber with external spring. Can be used for: Simson S51, S70 MZ ES175, ES250, ETZ125, ETZ150, ETZ250, TS125, TS150, TS250 The product of the MZA, which is the exclusive holder of the SIMSON brand. GPSR Contact: MZA Meyer–Zweiradtechnik GmbH, Baunsbergstr.