Stoeger/Uberti Single Action Bolt Spring Question

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Cornhusker77

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I'm probably missing something incredibly obvious, but I'll put my ignorance on full display and go ahead and ask.
The little flat spring that runs the bolt and trigger return broke, which I gather isn't that rare, so I ordered a Wolf spring from Brownell's.
When I put the new spring in and tighten the screw down tight, the hammer won't pull back, and the cylinder won't rotate.
If I back the screw out that holds that spring, even just a half turn, it frees things up and it works fine.
What am I doing wrong?
Thanks in advance.
 
You are right that this is a very common failure on SAA type of pistols. One of two things could be happening. The most obvious would be that the Wolff spring is thinner and lets the screw protrude enough to contact the bottom of the cylinder, locking it. The other possibility is the trigger leg of the spring is too long and is binding the trigger when tightened.
It is common to have to do some hand fitting on these springs.
 
That is strange. I would put a thin washer representing the half backed off perceived distance and try it again. If everything works then maybe the screw is interfering with something. If it works just leave the washer or trim the bolt.
That's just a guess.
Seems the screw is the problem.
Can't see just one half turn being a too long spring but anything is possible. Have read that some springs for that have to be trimmed but not all the time. It typically happens if installing a like spring in other than the actual model/manufacture gun. Some parts of still in production guns use same basic parts but all can be a bit different and require fitting.
 
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Thanks guys.
I never thought about the screw being too long
I'll take another look when I get home.
 
Well, I finally got around to taking it apart again and checking things out.
The screw does not protrude, and it's not hitting the cylinder..
I'm not 100% on the mechanics of these things, but it seems to me that whatever mechanism pushes the bolt out of the way may not be up to snuff?
Is it possible something up in there is broken or worn and just can't overpower the spring tension when it's tight?
 
Since the screw is not too long and it works with the screw backed off, that suggests that the geometry of the new spring is different from the old one. Either put in a shim/spacer as was recommended or reshape the spring.
 
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