Inspect those used revolvers carefully.

[WarPig1976]

Had a chance to bob the hammer and smooth the trigger last night. Bobbing the hammer was the old school way of dealing with a faulty SA or to make a revolver more concealable. This hammer I did for demonstration since it's not going on the gun.
First just make the curve or line you want.
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I use a Dremel with a cut off wheel to make the initial cut and turn it horizontally and move back and forth to remove the bulk of material.
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File work to get the final contours.
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And finally 220 grit sandpaper to finish it off.
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This trigger is going on the gun and since serrated triggers can make you finger real sore real quick so,, grind 'em off.
Again the Dremel this time with a grinding wheel. Just grind the serrations off slowly and stop. Then a sanding drum with 220 grit to get your final shape. Finish off with 220 grit wrapped around a wood dowel. Easy as pie.
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All the tools I used minus the cutoff wheel,,,,if you don't have a two foot long pipe wrench forget about doing this,,,your not manly enough....
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Sorry about these photos!!!! I'm taking them with a phone and I guess there's an up and a down....even though you see them all as up until you post' em.....