For better handling, rotate your shock-absorbers when you rotate your tyres. The pattern for Tyres varies by make and model, but the rotation pattern for shocks is fixed on all non-McPherson Strut-equipped vehicles. It is a seven station rotational pattern: Nearside front to offside front, offside front to rear floor of passenger compartment, rear floor of passenger compartment to nearside rear, nearside rear to offside rear, offside rear to boot, boot to space between the battery and the nearside front wheel-well, space between the battery and the nearside front wheel-well to nearside front. Vehicles fitted with McPherson strut damper units will never have to use this system since the units are designed to fail within a year and must be replaced in pairs. Vehicles fitted with rear lever shocks use a six station pattern, omitting the space between the battery and the nearside front wheel-well and rotating only front with front and rear with rear units. At this time the polarity of the battery should also be rotated to reverse electrode furring by switching the connections at the electrodes.