I used a small amount of superglue to keep the nut and washer and knob all together. I like them because they aren’t so large and sloppy looking as some others I have found while shopping for a pair. Im hoping the more I wear them they will get use to the size of my head. Pretty stable to walk in. No piling seen. Charging lasts a long time as I use it with phone calls, streaming music from phone or podcasts from the computer. I wish someone would come up with a better design. talla bien. Nellultimo anno mi sono capitati (in ordine sparso):auricolari con suono metallico, microfono inutilizzabile, pairing faticoso (impossibile in un caso), connessione instabile, batterie di durata infima o del tutto non funzionanti, e altre amenità del genere. Mounted to my RV to the bumper with no problems.