For swinging bells, the wheel side of the bell is where the swinging motor will be installed, and a tolling hammer will always be located on the opposite side from the wheel.
Stationary bells can have either outside tolling hammers or inside clappers. The electro-mechanical and physics aspects of this choice generally is made on the basis of how loud the bell is intended to ring.
Outside hammers have gravity on to help with the striking and inside clappers have gravity working against them. Generally, choose clappers for musical instruments and hammers for tolling bells.
=== Riser diagrams ===