Changing just the tumblers will do nothing for you. You need to change the whole lock plate out in order to convert to rebounding hammers.
Rebounding hammer lock plates have a step in the bottom of the plate that sticks out and stops the mainspring from traveling down past the bottom of the plate. You will notice that your plate does not have this since your spring hangs off the bottom of the plate. That little stop point is the part of the rebounding lock design that makes it all work.
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B. Dudley
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