Thanks ... the Mayo Clinic site says:
"Avoiding a tight grip on tools by building up the handles with pipe insulation or cushion tape
Using gloves with heavy padding during heavy grasping tasks"
I guess I will try padded glove and see what happens. The GripGrab Super Gel looks like it offers lots of padding so I plan to try those first:
SUPERGEL
1005
The SuperGel is the most shock absorbing glove in the range, featuring high end materials and 6 mm DoctorGel padding. This pair of gloves offers maximum protection against fatigue and numbness of the hands related to cycling activity. It is the perfect choice for riders who desire maximum comfort on the bike.
DoctorGel? | Gel Padding for Cycling Gloves | GripGrab