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HillBill,
That Ruger cylinder you want is NOT a "drop-in".
Factory dual cylinder guns have both cylinders fitted to the frame.
The ratchet-to-endbearing dimension must be fitted by selecting and/or grinding on the cylinder. If you buy a used cylinder, it very likely will either be too long (fitting necessary), or too short (excessive barrel-to-cylinder gap and cylinder end shake).
Re-timing of the revolver should not be necessary if the ratchet is orginal, although it should be checked, of course.
That Ruger cylinder you want is NOT a "drop-in".
Factory dual cylinder guns have both cylinders fitted to the frame.
The ratchet-to-endbearing dimension must be fitted by selecting and/or grinding on the cylinder. If you buy a used cylinder, it very likely will either be too long (fitting necessary), or too short (excessive barrel-to-cylinder gap and cylinder end shake).
Re-timing of the revolver should not be necessary if the ratchet is orginal, although it should be checked, of course.