Fabrication!

Here is our current revision of the linkage we are planning to use. it is make of 0.25" angle aluminium. 

The next step was to secure the foam fist to the part of the linkage that is made to extend out. We came up with the idea to use spray expanding insulation to secure the fist to the piece of aluminium. 

After a night of curing the foam insulation expanded nicely and is holding the fist to the piece of angle nicely. 

Unfortunately over night the rid we had set up to hold the metal straight broke and it set slightly angled. This should not be to much of an issue. 

After shaving a bit of the foam off we decided to integrate. Its looking promising.