The first version of the model 4.

 The improved weights, and stops making the version 4 a powerful design.

Two halves as individual units with their own independent electrical systems.

An improved weight design using a hollow shell which is then partially filled with steel shot creating a "dead-blow" lengthening  the time every pulse exerts force.

The improved stop is not just stronger, it is adjustable and is not prone to any type of "binding" during start-up.

The improved stop is not just stronger, it is adjustable and is not prone to any type of "binding" during start-up.

Ready for "Live Testing" in a real vehicle on public highways.

Accelerometer Pattern.

Bias indicated below the line which is the forward direction. 

Accelerometer Pattern.

Bias indicated below the line which is the forward direction.