Hero robot : what is hammer-like obj opposite gripper ?

Is the hexagonal hammer-like object on the opposite end of the gripper on the Hero robots just a counter weight? I've always been
puzzled about that and finally thought to ask about it tonight when I saw one on eBay.
Thanks ! JCD
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
It actually houses the stepper motor that makes the arm shaft extend and retract. And does double as a counter weight.
JB
pogo wrote:

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here. All logos and trade names are the property of their respective owners.