Ice lock

Finished July 9th 2019
It is sized for a maximum of 30mmx30mmx30mm ice cube to be inserted I don't know how this would react to being filled and frozen.

I made one of these out of wood a while back but it broke and I never made a new one.

If you have any ideas for modifications feel free to suggest them.
I may make another one with holes for melt in threaded inserts.