Dear Muth

Could you please explain the below quoted statment.

"As per my knowledge , once the rod removed , stiffness of the Whole system will get disturbed"

I would expect some form of mathematical formulation and explanation involving a simple system say cantilever one end fixed (Nozzle) with vertical load at free end and spring support somewhere in middle of nozzle and free end.
I would like to see disturbance in the stiffness for this simple system first.

Dear habib your input are also required as you have also understood this point clearly.

The below point was also beyond my imagination....could you explain it further.
"( this because of 12.5% of material increase per feet)".

Regards,
Aslam