Yes, I have been driving the car without the rod.
From what I can understand, the SLS valve regulates the return flow, and there must be some kind of check valve that holds the car when the engine is not running.
I have been thinking about that there could be pieces of old accumulator-membrane somewhere in the return line.
The factory shaped return lines are not available anylonger. The lines have been replaced by "to be adapted during assembly" lines.
I have been bending brake lines in the past, and this is not a funny job, even with proper tools.
I want good looks and perfect function.
The subframe must down (again), etc, so this is a job.
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