The displacer is made from a cut down Pringles tube that is glued onto a few cardboard discs. I cut the cardboard disks out to about 6mm smaller than the diameter of the Pringles tube, the cardboard I used was quite thin so I glued three disks together to make sure the Pringles tube was properly supported. The pringles tube is cut to about 9cm and open at both ends.
The displacer is made from a cut down Pringles tube that is glued onto a few cardboard discs. I cut the cardboard disks out to about 6mm smaller than the diameter of the Pringles tube, the cardboard I used was quite thin so I glued three disks together to make sure the Pringles tube was properly supported. The pringles tube is cut to about 9cm and open at both ends.