+1. Also, this element mount hasn't even been used to heat water yet, let alone brew beer. Rollinred presented this as an improvement over kal's system, yet really it is just another method entirely. Is it the best method? That is up to the builder/user and is just an opinion. Everyone is entitled to one.
Rollin also has a misunderstanding of how an o-ring works, especially in Kal's system. His method may work fine, but Kal's method remains the best weldless element installation. It has been proven many times by many people and is completely safe.
If the point is wort leaking into the box because of a theoretical o-ring failure, that point is unproven. Kal's method doesn't allow the box or element to move, so I cannot see how the o-ring would get damaged. No one would purposely install a defective o-ring.
I think a welded coupler installation like Ischaivo's method is ideal, but welding isn't an option for many. Did this start out as a build thread? Nevertheless, this is a good discussion, maybe we need to have an ultimate best of all time way to mount an electric element thread.