Need Some help for a running mechanism

#1
I am trying to make a runner that uses a mechanism like this:

So a large wheel rotates,but a block attached to the side of it isn't. I don't know how to make it like the other guys can. I need help so for now I need like 5 knights to support it.

btw, does a balloon attached to a grabber on a very fast moving leg can support it? Just curious.
 
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