Pivoting can further be distinguished into proxy pivoting and VPN pivoting. In a tilting or pivoting block action, the breechblock is hinged at the rear. Each seat has an adjustable head restraint with the front ones pivoting on SE models. Commonly, springs are mounted on control arms, swing arms or some other pivoting suspension member. Also revised were the valve actuators which are of a roller pivoting arm type. It uses a kiteboarding kite to induce a rocking motion in a pivoting beam. It is made of two rigid sections linked by a pivoting joint. A driver-selectable amount of slip on the pivoting wheel is allowed to prevent soil damage. Later, both naval and garrison carriages evolved traversing platforms and pivoting mounts. Like those tools, it is capable of creating curves with edges, by pivoting its table. A variation of the partial pivoting strategy is scaled pivoting. Both designs were near-identical except for differences in the approach used for pivoting the pads. Partial pivoting adds only a quadratic term; this is not the case for full pivoting. This can be done by reordering the equations if necessary, a process known as "pivoting".