This subject have been beaten many time. Thanks to Alexander I have moved on to the next stage of improvements.
Thanks
@Rednaxela.
I think it is necessary to stress the fact that your posture and sitting position is ULTRA important.
1. FB Courtney always order a dinning table from Sears each time he settle down on a job. As Alexander suggested. It's just the right height to do your stuff and plenty of spaces.
2. Follow the manual on placement of your left and right arms. Use finger glide and your elbow just off the table's edge. This is the pivoting points for all pull/pull, etc.
In one manual, it is suggested to dress so that the arm extends and retracts against your jacket's sleeves. Really cool stuff! This gave me an idea to put a post-it note on my forearm where it meets the table .. free to glide!
3. Posture is everything. Right posture will prevent pain! YEAH! You heard me P.A.I.N!
Pain from failure.
Pain from physical fatigue.
Pain from mental dissatisfactions.
*** UPDATED 06/22/2017 ***
From Modern Business Penmanship by Edward C Mills


From Palmers Penmanship Budget by A.N. Palmer