Old fish feeder mounting question

kris2001

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I've been using this unknown brand of automatic fish feeder, there is a hexagonal shape cavity on the bottom of the feeder what's the use of it?

Is it because I can put a hexagonal head screw in it and tighten it ? the screws I had at home didn't fit it perfectly it feels like sliding off.

20210826_212809.jpg 20210826_212814.jpg
 

vetteguy53081

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It is meant for a mounting rod that came with it
 

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