Panavise Helping Hand Mount

This is a remix of [Adafruit](https://www.thingiverse.com/adafruit)'s [Helping Arm Attachment for Panavise Jr](https://www.thingiverse.com/thing:1715890) (which is a remix of this [Helping Arm Attachment for Panavise Jr](https://www.thingiverse.com/thing:1708828) by [XYZAidan](https://www.thingiverse.com/XYZAidan)), and changes the helping-hand screw socket for a socket that supports the articulated arm connection from [giufini](https://www.thingiverse.com/giufini)'s [PCB Workstation with Articulated Arms](https://www.thingiverse.com/thing:801279).

I also make the mount side slightly smaller so it would friction-fit my Panavise 209.