MK8 Adjustable Dual Extruder upgrade

I saw http://www.thingiverse.com/whpthomas/designs design of upgrade extuder head, and since I had problems with this, I made a derived a new design that fitted my Replicator 1 Dual.
Using a spring that we have at work its partNo 1180 and should be avalible as a spare part for Poseidon diving equipment.

It is also made for the dual extruder thats why it is sticking out upwards instead of on the sides, and the adjustment screw is inside the handle.

I made the pressure of the spring adjust