I still don't like hose clamps.
However, I'm happy to report that tightening the clamp mentioned back here took care of the coolant leak. I love easy fixes.
Now I just have to get a new battery for the Vespa ET4. I was disappointed to find that my local purveyor of fine motorcycle batteries did not have a suitable battery in stock, so I'm going to have to go somewhat out of my way tonight to get one. Also, just to make sure everyone knows, the kickstarter on the ET4? Worse than useless. I was told it didn't work if the battery was dead, but I didn't realize it wouldn't work if the battery was just too low to crank the starter.
Disappointing. It's a good thing the little Vespa has so much going for it otherwise.