Double Ended Jar Ring - Join Two Jars - 3 Versions

I took scootercommuter's Wide Mouth Jar Ring and modified it so that a jar can be screwed in from both ends. The sizes of the jars can be mixed, depending on your requirements, as long as they are both wide mouth mason jars.

There are several different uses for this adapter:

1) Use WITHOUT the jar's metal lids to store things normally too tall to fit in a single jar, like uncooked spaghetti

2) Use WITH the metal lids as a lunch container with different food items in each end

3) Use WITH the metal lids as a container to store different small items in each end, like nuts and bolts or different sized screws

4) Use with sealed canning jars for space saving and stability when stacking in the cupboard

5) Use WITHOUT the jar's metal lids as a mini greenhouse with dirt in the bottom and a glass dome on top.

UPDATE:
Added a Double Ended Regular Mason Jar Ring
Added a Double Ended Combo Ring - Regular on one end, Wide Mouth on the other

These last two versions wer