Off balance tub made banging noise during spin.

Washer was making loud banging noise during spin cycle. I noticed that tub was off center within washer housing while turned off. Removed top and checked for springs used to hold tub centered in the housing. Found one spring loaded support rod (Dampin)that had a broken spring. Due to two different part numbers, PS4125965 and PS4125966 it required considerable time to order the correct part, no parts supplier was aware of the reason for two part numbers. I had to contact the engineering department of Haier to fine the correct item, one number is for the right side the other number for the left side of the washer tub. Part snaps in place in upper corner of the washer housing and in a slot at the lower edge of the tub. No tools required to install Dampin just a screwdriver to remove top of washer. Parts arrived two days after ordering, very good service.