Lewm, it sounds like this is a semi automatic table. The gear will force it through a cycle if the button is pushed. You should be able to manually turn the platter to get to the perfect point in the cycle of lowering the arm having the platter able to spin without the motor actually kicking in. That will prevent the platter from taking off and may even keep it in place.
And yes, I'm paranoid. Too easy to bend a stylus.
And yes, I'm paranoid. Too easy to bend a stylus.

