When a revolver developes excessive endshake, the clearance between the end of the ejector rod and the forward locking bolt changes, often enough to make the tip of the locking bolt snag on the end of the ejector rod.
When you press and hold the cylinder release, check the end of the ejector rob as you open the cylinder. Is the end of the inner extractor pin flush with the end of the ejector rod? If not, those few thousandths of an inch below flush may be enough to snag the tip of the locking bolt, making for hard opening.
The fix is to correct the excessive endshake and/or refit the end of the extractor rod.
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