Malcolm S Waynesville , NC March 31, 2020 Appliance: Whirlpool Washer WTW4800XQ4 Whirlpool Washer Wtw4800xq4 / : Vibration and heavy knocking when spin cycle starts!. How to replace Tub Centering Spring Kit. New suspension set and four tub centering springs. The tub centering springs were not fitted as standard on our machine but as they were an option and given the fault I decided to fit them at the same time as replacing the suspension. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes