HM2 I have seen two different types of throttle locks, the knurled slot type, and another type with a swiveling toggle. I don't think much of either type, so I removed mine, a knurled one and made my own out of aluminium angle which I mounted of the top side, with the mirror going through it. If needed I will post a picture on the weekend. And Laitch what's wrong with a bit of mayhem, you have admitted to driving a Prious.
Regards Martin.