You get what your pay for generally, buy cheap electrical goods from China = Fire.Mine is a bit slack and comes out when I don't want it out, so I can assure you it just pulls.
The USB adapter I got was genuine BMW 2 socket from eBay at around £23 , ( BMW direct or main deale) accepted this is dear , but it charges very quickly and a friend had a cheap usb main adapter from eBay that went on fire , so I have become rather carefull in these type of items now.
I do not have the knowledge to see if they are unsafe or ok
A free fix is the best fix.Well that was simples. Drill bit (wrapped in tape!) Down the hole twiddled about a bit. A liberal squirt of eleccy contact cleaner and Robert is your mother's brother.