Homebrew PCBs

I have completed and air sparger described on the Think and Tinker
website. It sits in the Coleman cooler. I drilled a 9/16" hole in the
lid so a piece of 1/4" schedule 80 PVC tubing from the sparger
protrudes about 2 1/2".

I tried using the tire air compressor I purchased on sale from Harbor
Freight as an air source. Here's the one I am using:
http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=43479

I drilled a 3/16" hole in a piece of 1/4" PVC rod to make a tube about
1 inch long. I glued this into a short piece of 1/4" PVC schedule 80
tubing  to make a connector to the air pump. Although the air
connectors supplied with the pump are threaded, the connection is made
mechnically with an expanding rubber seal at the end of the pump air
hose, and the 1/4" tube works just fine without any threads. My Tygon
tubing fits snugly on the 1/4" sched 80 pipe of this fitting, as well
as at the tank end. It can also be readily removed in order to get the
tank top off.

The sparger works just fine, with lots of air bubbles roiling away in
the water. The only potential problem is how long this pump can run
without a break. I assume it's the same kind of pump as an aquarium
pump, though not as quiet.

Anyway I am moving along (finally) and hope to have the etching tank
working within a week.

I am curious how others hold their PCB in the etchant. I have some
1/4" PVC sheet I can use to make some kind of holder but no "aha"
experiences have come to mind yet.

Grant