There are some good cgi ones
https://youtu.be/dKjCWfuvYxQ
https://youtu.be/y3RIHnK0_NE
Type: Posts; User: Brighty
There are some good cgi ones
https://youtu.be/dKjCWfuvYxQ
https://youtu.be/y3RIHnK0_NE
They don't always work, sometimes they fail, then get in a strop, then fall over
https://www.youtube.com/watch?v=JzlsvFN_5HI