The bottle sling looks great, but the video is when it is not whirling. Does is work as a sling too? And is it tricky to open at the right moment?

Nice clocks, but it must be hard to sleep when they do ring.

Willeke

It does work when hurling too, it was just easier to film like that.
I'm not really sure if it released at right moment, but when I was slinging (I was slinging just to test it, like just...slinging) it worked well.

I've got used to the clocks, so I don't hear them. It's worse sleeping without them... I love my clocks, even though it's much work, I'm really happy to have them. Some of them have to be pulled up twice a day, so I've got that habit that I every morning when I get up, pull them up.
I buy them cheap, because when the oil dries out, people think that they just dont work. So when I buy them, I get them cheap, use an hour to oil them, and once in a while I check them and make them go right. Not much work, but really fun.  

Gard

Haha, good idea! Several tennis balls at once...I've got some plastic pipes at that size, I'll try! Wonder if you can throw darts too? They'd have to be pretty short, but like 10-15 cm would work, I think.
Good you like it!

Gard