If your K22 carrys up in slow double action, but does not in single action, you have a sometimes difficult fix. Theoretically, if it times in double action, it should always time in single action! But, I have found guns that behave like yours. Sometimes installing a wider hand will fix you right up, sometimes it will fix the single action, but bind the double action!!
I would try a hand wider than your by .001 first, then .002 if the .001 still does not do the job. If that does not fix you issue, the next step is to send it to some one that is well versed on Smith actions.
You will need to measure your hand and the get some wider than yours. Not all hands fit the same, in my experience. I have installed hands the same width that will work different, one may work, one may not. Any K frame hand will work, the two pin ones have been replace by three pin, but either will fit. I am not a fan of peening the ratchets. I guess I'm just not good at it, but I have distorted the ratchet profile, and it seems not to last. Maybe just me, but it seems to require an expertise and maybe tools I do not have.
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