Start by flipping the jar onto it’s top and gluing the MDF ring down over the the jar as shown above.
Find these two large rings. They will form the base.
Glue the two rings on top of each other and the lid of the jar into the center.
The pieces will be the base plate for the cap.
Insert 8 of these pegs into the base plate as shown above.
Glue the plate shown above onto each of the pegs.
Add this plate on top of the previous one.
Glue this small ring around the parts of the pegs still protruding from the top.
Simply glue the cap onto the jar and the build is complete.