Mojo and the dummy body

I made a body for Mojo, I just need to stuff it more and make it heavier. The idea is to desensitise  and counter condition him to having someone mounting and being not very balanced about the process. He wasn’t bothered about the “body” after the initial sniffing at it outside the arena, it was on the fence whilst I groomed him.
The plan now is – once the body is heavier and sits better – to walk him round with the body on and get him used to someone wobbling on top.
If a horse feels out of balance with the rider it makes them fearful – just like we are if we feel unbalanced and about to fall. As the sympathetic nervous system takes over the horse may run or he may freeze. Mojo tends to run in  these situations.