single action problem

[skoal]

At the range today and fired 10 rounds on round 10 I heard the sound of something pinging off the concrete floor (I was the only one on the range) and sure enough my cylinder pin was sitting on the ground in front of me

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Everytime I pull the bang switch the pin backs it's self out see video
Thoughts?
Gun stats- pietta 1873
-.357
-round count 60 (30 .357& 30 .38 special)

 

[JTF#]

can you put a pic of just the pin?

 

[fdc]

Is the detent mechanism (base pin catch screw) fully engaging the base pin? Perhaps you can try to turn it in a rotation or two?

 

[skoal]

 

[Potasz]

Is the detent mechanism (base pin catch screw) fully engaging the base pin? Perhaps you can try to turn it in a rotation or two?

X2 on this one there is a little screw that you need to get in just right

 

[skoal]

The notch on the cross pin seems to be lining up properly to the cut outs on the cylinder pin.

 

[JTF#]

if you put the pin in all the way and dry fire the gun does it push out the pin? on my gun it pushes the pin out just enough to catch the cross pin but then it stays in.
i wonder if you are pushing the pin in to far then the force of the hammer is pushing the pin out past the cross pin.

this is what my pin looks like.

 

[Alex McK]

It is likely there isn't enough spring tension on the detent. When the revolver is fired, recoil force overcomes spring tension on the detent. The detent pops out of its notch and the and cylinder pin falls out. As already suggested, you could tighten the detent screw a little, to see whether this cures the problem. If not, you may need a stronger detent spring.

 

[skoal]

if you put the pin in all the way and dry fire the gun does it push out the pin? on my gun it pushes the pin out just enough to catch the cross pin but then it stays in.
i wonder if you are pushing the pin in to far then the force of the hammer is pushing the pin out past the cross pin.

this is what my pin looks like.

You may be onto something here

It is likely there isn't enough spring tension on the detent. When the revolver is fired, recoil force overcomes spring tension on the detent. The detent pops out of its notch and the and cylinder pin falls out. As already suggested, you could tighten the detent screw a little, to see whether this cures the problem. If not, you may need a stronger detent spring.

Gaver a little turn and we'll see,I think you both might be in the right direction.

 

[BCRider]

You're not ensuring that the spring loaded cross pin is locking into the groove correctly. Or for some reason the barrel of the cross pin isn't able to pass over the groove.

I know that on my own Piettas the pin likes to try to turn a little as I push it into place so I always make sure I can feel and see the cross pin snap into place and then I push and pull on the base pin to aid the cross pin in finding it's way fully home into that groove.

If your cross pin barrel has a burr or if the notch isn't quite deep enough to let the cross pin snap fully into the locking position then it may well let this occur. You'll want to use two screwdrivers to remove the cross pin and then insert the base pin and check that the cross pin can slip fully into place. If it hangs up on something find out what the issue is and fix it.

But the more likely cause is that you're simply not lining up the notch correctly. The notch needs to be facing straight "down" so the cross pin barrel can fit correctly. The most common way to hold the gun while inserting the base pin is upside down so "down" in this case is actually upwards. The cross pin moves across and over the notch. Which is why it's called a "cross pin". If the cross pin is in place correctly you won't have any trouble at all. It's impossible for the base pin to walk out if the cross pin is correctly in the notch.



I just read the bit about the spring. Yep, the cross pins DO have a tendency to loose up on the cross pin screw. You're going to want to buy a proper width screwdriver and dress the blade to fit the nut side. This means grinding or stoning the thickness to suit and then cutting a clearance notch out of the middle of the blade to fit over the threaded stub. THEN you can use the two screwdrivers to correctly tighten the cross pin and cross pin "nut". Just a pinch will do since the threading is a really small size.

 

[skoal]

Rubbed a cotton ball on the pin and sure enough there were tiny burr you couldn't even see around the cut outs and around the chamfer on the back of the pin. Knocked the burrs off and she's seems fine now.
Thanks for the help guys.