Wanted a knob other than the standard/stock swing-tab bolt that comes stock with the HEQ5 mount. Had tried several designs that just didn't have the clearance or meant that I would have to modify the stock bolts.

This solutions allow you to keep the existing stock bolts without modification, HOWEVER(!), will not be helpful if you are at a latitude greater than 45 degrees :( as there is insufficient clearance. 

I find these knobs to be very easy to get those finer adjustments on latitude.

This print was done at .2mm, PETG, 20% infill. If you do want to drill a hole in the swing-tab bolt, there is an accommodation for an M3 nut and screw.