BUY PVC PARTS - To construct the cell you will need three parts: a 4" diameter piece of PVC pipe (24" was the shortest length I could buy); a 4" diameter PVC pipe cap with threaded end; and a 4" diameter threated plug. As a cheaper alternative you could cap the end of the pipe with a rounded slip on cap but you would have to lean the pipe against something to keep it upright. I was looking for something flat that would stand on its own.
MEASURE 9" PIPE LENGTH - Mark off 9" on the pipe or the length of your cell up to the cell's head. You want to be able to immerse all the plates without immersing the head of the cell. You can make this a little longer than your cell and adjust the immersion length by filling the bottom with small stones. Then mark a line around the outside of the pipe to help guide your cut.
APPLY PRIMER - If your sawed off end isn't quite square, glue that end to the cap so you have a nice finished end at the top of your tube. Gluing is a two-step process. Coat both surfaces to be joined with purple primer to chemically clean them. Be careful with this primer. It will permanently stain anything.
IMMERSE THE CELL - Place the cell into the acid solution up to the cell head. DO NOT IMMERSE THE HEAD. If you place two strips of wood under the head, they will keep the head out of the acid solution. After a few minutes, remove the cell and hose it off until the plates are clean. Check that the plates are not loose.