OK, here's the detailed layout of washtub bass engineering.
This is the $1.50 eye bolt used to connect the string to the tub. As you can see, it is quite complicated. The other side has an eyelet just like this one. The line is nylon, I forget which size, but it's a 7' segment, and cost me $.25 a foot.
This is the actual tub. There are two kinds of tub you can get. "Hot dipped" which is shiny and stronger, and the other kind (like this one) that isn't as strong but sounds better. This one is a 16.5 gallon tub. Bigger is louder, or so I am told.
This is the Jerome's Not Yet Patented Goodwill Teak Delux Resonator. Otherwise known as "a wooden plate." This helps to transfer vibration to the tub, and it also helps to prevent from yanking the eyelet through the tub as you yank on the stick. Stick not pictured.
This is the Deluxe Model Rubber Foot (a.k.a. "toilet plunger"), which helps keep the lip of the tub up, and allows it to sound out a bit more. You can see the delicate custom fitting I cut into the top with a band saw and a metal hasp.
And when you put it all together, it looks like this.
I'm going to build a legitimate four string upright washtub bass the next time I get ambitious.
Someday we'll win this thing...www.aclosesecond.com