Being as you need a new "replacement" tumbler if Al doesn't have one look on E-Bay there is a lot of trapdoor parts and stuff on there all the time and prices are generally reasonable.
It appears from the grinding on the main spring and sear that it was done to eliminate the interference problem.
You may want to think about replacing the tumbler and sear to the three click version for safety reasons the middle click sets hammer open not on full cock for loading ease.
The 45-70 Springfield Joe Power book it excellent for info history on these guns, and Spence Wolfs book Loading the original 45-70 is very very good on loading and shooting these guns and also covers the reloading equipment required.
Goode luck happy shooting
Jim O
It appears from the grinding on the main spring and sear that it was done to eliminate the interference problem.
You may want to think about replacing the tumbler and sear to the three click version for safety reasons the middle click sets hammer open not on full cock for loading ease.
The 45-70 Springfield Joe Power book it excellent for info history on these guns, and Spence Wolfs book Loading the original 45-70 is very very good on loading and shooting these guns and also covers the reloading equipment required.
Goode luck happy shooting
Jim O

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