The important thing is to put the screw from the outside of the acrylic casing and
the standoff from the inner side.
You'll have to fasten it with your fingers. No tools are needed yet!
Now, do the same thing for all six of them!
This is what you should have at the end!
Put this casing on the front side of the PCB.
Off to use the other acrylic casing!
This is what you'll be working with: the acrylic casing you have left, six standoffs,
and six smaller screws.
The process is the same as for the front casing.
