In this case the pad is squized between to metal plates. It's not rubber, maybe work. Interesting to know for the future were the limit is for what plastic can be used for.
It cost me 4 Euro in material to print it, if I had let a workshop make the pad in metal it had cost at least 40 Euro, and it had been of much simpler shape. The weight of plastic material is much lower and it don't rust either :-)
Some updates:
http://www.astrofriend.eu/3d-printin...1-eq6-pad.html
/Lars