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Old December 16, 2001, 04:03 PM   #1
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Join Date: December 22, 1999
Location: South East
Posts: 399
S&W M40/640 action job

Took apart my 640 and did the usual slicking of slide and deburring of frame . Also smoothed the sides of trigger,hammer and took 1 1/2 turns off the rebound spring and hammer spring. HOW FAR can I go removing turns on the hammer spring? I don't have a spare....THANKS...dewey
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Old December 16, 2001, 07:06 PM   #2
John Lawson
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Join Date: August 28, 1999
Posts: 281
You will be in immediate trouble if you clip coils off the springs. Refer to the Wolff catalog for replacement springs of lighter gauge wire allowing full motion, which you often don't get when you clip coils.
"Politicians are bilgewater in the ship of state."
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Old December 16, 2001, 07:27 PM   #3
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Join Date: February 20, 1999
Location: home on the range; Vermont (Caspian country)
Posts: 14,270

Listen to Mr. Lawson; he's one of the top professionals in the world.

(Not sucking up; got some of his articles on my shelf. Love the 9x21 conversion for carry.)
"all my ammo is mostly retired factory ammo"
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Old December 16, 2001, 08:40 PM   #4
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Join Date: December 22, 1999
Location: South East
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Thanks, I'm not to

stupid to ask NOR to listen. BEST....dewey
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Old December 16, 2001, 10:28 PM   #5
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Join Date: October 29, 1999
Location: Dewey, AZ
Posts: 12,858
Interesting. Kunhausen advocates cutting of stock Smith n Wesson springs over replacing them with aftermarket springs.

No opinion on this one...just find it interesting.

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Old December 17, 2001, 11:38 AM   #6
Mike Irwin
Join Date: April 13, 2000
Location: Northern Virginia
Posts: 37,306
Hey Sam,

Opinions are like Smith & Wessons. Everyone has one.

I don't like the concept of cutting springs, either, just as I don't care for backing out the strain screw.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza

Baby Jesus cries when the fat redneck doesn't have military-grade firepower.
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Old December 17, 2001, 01:35 PM   #7
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Join Date: November 30, 2000
Location: northern california
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the first thing you should do is get another main spring...never cut a spring unless you have a spare already on hand. my personal inclination is to leave the rebound spring alone...i want that trigger to snap back as fast as it can.

smoothness always beats out lightness in an accurate DA trigger pull
the map is not the territory
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