Anyone else out there with fat fingers that have difficulty connecting an external antenna using a PL-259 to SMA adapter to their handheld radio? Here is the answer:
3D print a 19mm disk, 5mm thick with 8mm hex hole in the middle. Lightly coat the interior of the hex hole using a Qtip with cyanoacrylate (super glue), slide onto adapter N nut allowing glue to set for 3-4 minutes.