Securing nut broken on Elite Floodlight - needs to be much stronger

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At 7:10am this morning the new Elite Flood light camera suddenly moved after being installed 10+ days. On inspection I found the large plastic securing nut had split. While I did the nut using the special spanner provided I would not say I did it excessively.

Any idea of the thread size or a 3D print to create my own.

Reolink are asking I send the entire camera back so they can send a new unit, which is a right pain as it is all mounted high up.