Just broke a piece during rear dash cam install, please help identifying a part

How long has it been, i might need to give it another go.
2 and a half months.

Just had a look and gave it a good pull, won't budge. But I noticed that there was a significant amount of "sweat" on the cable that I hadn't noticed before, that got me thinking it might be the defroster weakening it?
 
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