While shopping at our local thrift store, I also found a great metal enclosure for my tap tempo switch for my Boss DD7 Digital Delay. I could use the internal tap tempo, but I really like having the external one since I find it easier to use.
The nice thing is that this entire project cost me the 99 cents I spent on the enclosure. I used an old 1/4 jack and the SPST switch that was originally on the feedback pedal I got for my other project. So all I had to do was empty out the original contents, drill the hole on top to the right size (it was a bit too small), install the two parts, and solder them together.
Getting the inside emptied was easy, but I ran into problems with the drilling. The metal casing is not aluminum and my 1/4 inch paddle drill bit did not carve a nice hole in the case like it did on the aluminum case for my effects loop pedal. It ended up just bending and twisting the metal. So I used tin snips to cut the jagged edges off and then a round file to get rid of the sharp edges. It took more work than I expected, but now everything is in there and soldered together as it should be.
You can see it on the bottom left of the picture.