I bought one and found it made no difference, so I changed my style. I couldn't do it using whole hands or finger tips on the surface of the piece. So now I roll or bunch my piece so I can rest my wrists on the surface of the machine table and using only my finger and thumb I pinch the pinch. All my movements are as easy as moving my fingers.
It's not orthodox I know and if you have and stiffness it might not work. Yes I need to reposition a lot but it works for me.
MaryKatherine