Hey all So i think this happens to call of you, the forearm muscle on your dominant hand is larger than the other due to intense playing, i am also experiencing this and wondering how it is it possible to balance both arms out.....another way other than working out maybe?
...or take up another strength-developing activity that uses both arms equally. For example, you could go climbing (especially on an indoor wall). This may be more fun, as you've implied you're not keen on "working out". Challenging routes on a climbing wall often don't give you much choice about which arm to use. You may favour your dominant arm, but you'll be forced to use your other one too.
If you do use weight training goes, try training the weaker side to failure and then just matching the reps with the stronger side. This will keep the stronger side from wasting away while the weaker one catches up.