wife has small hands with arthritis and a mdl36. We had to go to a lighter mainspring and have light strikes on a couple different brands of 38 Spl. Anyone have recommendations of some thick-base brands with decent performance?
Get a different gun. A striker fired pistol with a "single action" like trigger is a better idea.
Get something like the M&P 9, Glock 19, Springfield XDM, FN Model FNS 9, etc.
I know the next comment will be slide operation. There are alternate ways to operate the slide, but if it is kept with one in the chamber for defense, as it should be, with high round count, it is less likely that operation of the slide is required.
The 9mm round is more powerful than the 38 special, but has MUCH less felt recoil than a J frame 38 special.
The 9mm full size will be less painful for an arthritic person to shoot, as much of the recoil is soaked up action of the pistol and the more ergonomic grip, and no matter how you slice it, a 9mm striker-fired pistol is just easier to shoot than a J frame 38.
Don't get me wrong, I like J frame 38s, but with the advent of pocket 9mm pistols holding 7 - 8 rounds or more, with light weight and easier striker fired actions with a trigger pull of 7 lbs instead of 10 - 12 lbs, the J frames just make less sense, especially for this application.