The cylinder itself is no problem, they’re all very similar dimensions within a couple of thousands in length and diameter. But you’ll need a pre 1961 cylinder for a later extractor to work, because it must be right hand thread. The TL extractor will not align with the cyl alignment pins in the new cyl unless you move the pins. But you won’t want to fit the TL star prongs to the new cyl, it’ll fit sloppy in the TL cyl f you swap back.

The new ratchet will need the ctr pin hole enlarged slightly for the larger TL ctr pin; .020" larger to be exact.

A post 1921 replacement cyl will be heat treated until 1945. On non-magnums, the heat treating was ordered eliminated Oct. 12, 1945 on cyls as of with improved steel which negated the need for treating.

The importance of retaining the original TL extractor system is mainly because of the ext mushroom knob fitting the barrel notches and more importantly, the TL system is unique because the ctr pin is front loaded under spring tension. All other N frames have ctr pins that are rear loaded. That’s why you’ll notice the TL recoil shield does not have the divot/ramp to retract the ctr pin and close the cyl.

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Jim
S&WCA #819