Rock Solid Adjustable Arm - An all-aluminum arm equipped with dual omnidirectional locking ball joints and a locking elbow joints allows for the perfect filming angle. Arm length between ball joints is 4". No plastic parts means minimal vibration.
I have been looking for this 20mm ball joint arm for a long time. it works perfectly, and made my life a lot more comfortable.
now I am adding a few more arm accessories for other play within my car.
I took a Tackform M8 ball and adapted it with a washer to M6 to fit a bicycle headset cap. Used this arm and a phone mount to keep my phone on my bike... Keeps it centered, perfect for photo ops tilted up or just using it for a GPS tilted down. Almost exactly as long as my stem. Flexible enough to fit my needs and sturdy enough to not move anywhere I don't want it to. Perfect!