Depends on exact nature - -
- - of the conversion done.
You really need to do a side-by-side comparison of your DAO conversion with a factory standard piece K-frame, to see how yours was modified.
Most probably, the single action notch was removed from the hammer. You may get off with replacing only that part. It is possible that the rear of the trigger was also altered, in which case, you'll need a trigger as well.
I can't understand the reasoning process of private individuals who convert revolvers to DAO. It is simple enough to simply decide to shoot without thumb-cocking. I've heard of some departments, not trusting their officers NOT to cock the hammer, which had this alteration made to their issue arms.
A revolver altered to DAO typically brings 10 to 30% less than an unmodified piece of the same type.
One, because the expertise of the alterer is usually unknown, even if the DAO mode is acceptable.
Two, because the utility of the revolver is decreased.
Three, because it will cost at least $50 for parts, plus cost of fitting by a qualified 'smith, to set things to rights again.
Best,
Johnny