How to reattach the top counterweight in an LG washer that keeps coming loose and making a rumbling noise
LG Washer Counterweight Rumbling
A rare occurrence.
Wrap electrical tape around each mounting bolt---5 times---at the end of the thread near the bolt head (not near the bolt tip).
Re-install the bolts with---either a powerful drill or socket set (10mm)
The electrical tape should help expand the TUB WEIGHT studs---slightly---for better retention.
Source: lg wm2501HWA front load washer counterweight came off