"Marrying" the sear and hammer is nothing more than accelerated wear, just like stoning or polishing.
If you have enough patience, you can do it with both the DA and SA on the 92. I don't recommend lightening the mainspring, as the hammer is fairly light, but you can do that too if you are sure the gun will never be used in any adverse condtions, like dirt, cold, sand.
Jim
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