Gas Ring in Cylinder of 64-2 2"

[kbm6893]

I just grabbed one today. In very nice shape, but I always break down used revolvers to see what's going on inside. This one was reasonably clean, but still had some old grease and oil in there. I took it all apart and gave it a sonic cleaning, and it is now drying in a case dryer for my brass to make sure it is fully dry. I'm not sure of the year of this, but I'd estimate mid 1970's. When I took the cylinder apart and placed it into the sonic cleaner, I saw a little washer in the cleaner that I have never seen before. I am guessing this is the gas ring. Am I wrong? It's just a little circle of metal. Is there a certain way to put that back in? Just drop it into the cylinder before assembling everything else? Does it need to be placed a certain side up? I don't see a difference. The serial number is 1D72890. Thanks.

 

[DEF3]

Almost looks like a powers shim

 

[kbm6893]

Almost looks like a powers shim

Ok. And where would I put it back?

 

[DEF3]

Was the extractor removed from cylinder?

 

[Vtgw938]

It is a bearing surface for the end of the yoke tube. Goes in over the end of the extractor. Takes out end shake, 0,002 or 0,004 inch thickness.

 

[ken158]

Yep - a previous owner apparently discovered enough end shake to require a shim. No up or down side and is installed as previously noted.

 

[kbm6893]

It is a bearing surface for the end of the yoke tube. Goes in over the end of the extractor. Takes out end shake, 0,002 or 0,004 inch thickness.

So pop it in the hole of the cylinder when the rod is out, make sure it's flat, and just assemble the cylinder, as always?

 

[kbm6893]

Was the extractor removed from cylinder?

The entire cylinder was taken apart. I've done it on every used revolver I've owned.

 

[DEF3]

Yep, can google endshake shim. Midway USA has a quick video on it.

 

[Vtgw938]

So pop it in the hole of the cylinder when the rod is out, make sure it's flat, and just assemble the cylinder, as always?

Yes but put some oil or grease on the end of the yoke tube as there may be more contact area. Just check it to make sure you actually need it.

 

[kbm6893]

Cylinder is back together. Thanks for the help! First time I’ve seen a shim in all the used guns I’ve bought. Guns seemed really tight.

Obligatory pics:

 

[RebCop]

They make them for the cylinder and the yoke for headspace. I use them all the time.

 

[kbm6893]

I know what a shim is. Just never seen one or really where they go to make them
Work. In all the many revolvers I’ve bought used, I’ve never had one in the gun.