Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2558378.
The HE3d K200 has a small piece of acrylic that mounts to the corner frame and receives the adjustment bolt. The design leaves a little to be desired. While this modification is not perfect ( a better one would probably attach to both side of each corner piece ) I do believe it is better.
The source thing has a recessed hole, space for a 4mm washer, and a recessed hole for the 3mm nut.
The changes for this design include correcting the distance between holes (mounting to adjustment) to what the HE3D needs ( as opposed to what the Anycubic needs) and also recessed the spring hole to capture the spring from moving.
Included is the openscad source file so you can change the clearance of the nut, spring and bolt holes as required for your printer ( the one printing the part). I do not suggest you change other sizes as it my surprise you as to what you get. (i.e. non-elegant way to get the shape I wanted )
Thanks to TheManMall for his initial design and to PeterH on the He3d delta printer owner group for pointing me to TheManMall's solution