Crane lock or detent modification?


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Sam1911
September 1, 2008, 12:53 PM
Hi!

I'm perusing gunsmithing sites for information on getting some work done on my 629.

I see references to a crane lock modification and some other things that sound similar.

Can someone describe this type of modification, what exactly is done to the gun, and how it helps?

Many thanks!

-Sam

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rcmodel
September 1, 2008, 01:02 PM
Adding a spring loaded ball & detent is used to help hold the crane tightly in the locked position without any flexing. It just adds another semi-lock between the front & rear S&W locking bolts.

http://www.brownells.com/aspx/ns/store/productdetail.aspx?p=9849

http://www.custompistols.com/bengtson/tooling/cranejig.htm

It is best accomplished with a milling machine, and is not for the feint of heart with an electric hand drill.

rcmodel

Sam1911
September 1, 2008, 05:20 PM
Thanks!

That makes some sense, though how tight can the lockup become simply through the addition of a spring-loaded ball? Obviously this can be overpowered by fairly minor pressure, or am I missing the point?


-Sam

Vern Humphrey
September 1, 2008, 05:35 PM
The original Smith and Wesson "Triple Lock" for all the ballyhoo did nothing for the gun -- for a simple reason. The detent was mounted in the frame and entered the crane extention, so the spring was pressing it backward. Under recoil, the detent became an object at rest, and unlocked.

The more modern versions have the detent (usually a ball) in the crane, entering the frame. When the gun recoils, the detent is pushed deeper into the recess and locks tighter.

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