substantially constant upward force to the riser 302 as will become apparent upon review of the subsequent discussion the system 300 exhibits similarities to both the system 10 and the system 100 the system 300 includes a plurality of levers 310a 310b 310c 310d which are preferably disposed in a symmetrical fashion about the longitudinal axis 306 of the riser 302 the radially outward ends of the levers 310a 310d are pivotally coupled to respective inner walls of the opening 312 in the floating platform 304 by respective mounting brackets 314a 314b 314c 314d the radially inward ends of the levers 310a 310d are pivotally coupled by respective motion compensation bearings 318a 318d to a mounting bracket 316 which is fixed to the riser 302 the motion compensation bearings 318a 318d permit the levers 310a 310d to move along their respective longitudinal axes in response to the relative movement between the riser 302 and the platform 304 therefore the connection of the levers 310a 310d between the riser 302 and the platform 304 is virtually identical to the connection of the levers 110a 110d between the riser 102 and the platform 116 in the system 100 the system 300 further includes a plurality of springs 320a 320b 320c 320d which operate in compression throughout the range of motion of the system 300 one end of each of the springs 320a 320d is pivotally connected to an inner wall of the opening 312 in the platform 304 by a respective mounting bracket 322a 322b 322c 322d the opposite end of each of the springs 320a 320d is pivotally connected to its respective lever 310a 310d in the manner previously described with respect to the system 100 however in contrast to the system.