Review on Sduck Replacement Parts - 18 oz. Cup with Sip and Seal Lid for Nutri Ninja Blender 900W/1000W Auto IQ/Duo by Gary Lucas

Bought as a spare for my son to take drinks with him when he leaves the house. The jar arrived on time, washed it and left to screw the lid on the blades. The threads are so tight you can't tell when the jar is sealed. Tired of blending leaky lids and messing up the blender? finally put the glass aside and stopped using it. Bought April 2017. For the sduck I would like a jar with a simple screw cap for blending like the jar that comes with the blender. I don't blame Sduck for this as I'm pretty sure they didn't know and doubt they actually produce them.