First point: is there a difference between dominant and non-dominant side ... grip strength?
10% rule says yes. R. and I present a mixed answer. I'm not quite 10% different (about half that). R. is a lot more than 10% different --- but he broke his non-dominant wrist a few years back and has some pain that it would be unwise to attempt to power through.
Here is Science:
This suggests that the 10% is more or less true ... for right handers. It's a right handed world, so left handers get extra, IRL training on their non-dominant side, thus evening them out?
Check out that table, btw. It has more data on the men vs women which has better grip strength question. The weakest grips recorded ... were in the men.
ETA: Okay, my lovely, but incredibly loud daughter is now playing with Siri, and we have banished her upstairs, because she is _yelling_ really loudly at Siri, in hopes that Siri will understand her if she just speaks louder. Obvs, not gonna work, but we can all now think a little more clearly.
While the initial comments on this post have veered off into a handedness direction, I'm not interested in handedness per se. I'm interested in different performance on one side versus the other (can lift heavier, lighter, the same; can grip the same, harder, less hard), and strategies for modifying those differences (my goal is to even them out) through training.
This is a great example of what I am chasing after:
In a typical weight training discussion of symmetry, the focus is on training both sides equally to avoid developing an imbalance. This article recognizes the imbalance pre-exists in many cases, probably from activities of daily living. The focus in this article/approach is one-sided training to compensate? not sure that's the right word.
Obviously, you can imagine lifting with dumbbells vs barbells, and adjusting the weight or reps to even things out if one side is weaker than another. The barbell would let you try to do more of the lift with the strong side (altho you would sort of think that would have an impact on form); the dumbbell less so. I'm looking for something marginally more sophisticated than that.