At the base of all the pins (hammer, trigger, etc) there seems to be a raised boss.

I usually debur/square up the base , polish, and shim but I've not seen the raised bosses at the base before.... That I can remember

Are these ok to debur and polish flat?

I wasn't sure if maybe because it's an aluminum airweight the pins may have raised bosses for added support or for another reason Im not aware of.

Probably just a materials strength question. Aluminum frame walls of a thickness equal to a steel wall probably don't "grab" a steel pin as tightly, and probably bend sooner if lateral pressure is placed on the pin. Like might happen if you dry fire with the sideplate removed.

If that's right, deburring and polishing the top of the boss wouldn't seem to change any dimensions, as long as you don't overdo it. But if it were me, I think I'd shoot the thing for a while and then see if there's anything bugging you about the action.

What, specifically are we talking about?

The raised boss keeps the steel moving part away from the alloy frame.
I've never heard of "debur/square up the base , polish, and shim" around the pivot pins. Is this a factory fix? I'm always interested in what's new.

Shimming hammer and/or trigger pivot pins is sometimes used as a gunsmith fix to square alignment that's out of true. Some tuners -- especially competition -- will do it to further slick an action; same for the deburring and polishing.

In an otherwise mechanically sound revolver, these are the farther reaches nuance in trigger tuning. I'm not aware that any is factory practice.

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Pickpocket

If you file down the “boss” area you will create additional friction on the hammer / trigger and end up having to put a spacer back in to eliminate that friction and obtain proper alignment. Don’t try to out engineer the engineers that designed your revolver...

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S&W factory revolver armorer

On the older guns, which didn't have the raised bosses, we used the trigger and hammer shims to center the hammer or trigger and prevent them from rubbing on the sides.
jcelect

The raised bosses on the frame and sideplate keep the hammer and trigger from rubbing anywhere besides the pivot points.

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protocalldesign.com

"or for another reason Im not aware of"

They are there to reduce friction.

Here's pics of the raised boss on an airwieght and a picture of a steel framed hammer pin boss. The steel is different than the aluminum.

I would like to know if the difference in the base at the pins is for strength. Does anyone know the answer to this specific question?

Attached Images

	638 airweight.JPG (29.6 KB, 28 views)
	638 airweight_2.JPG (31.6 KB, 35 views)
	SW-686-Polished-Surfaces-1024x579.jpg (76.8 KB, 32 views)