I have been using Birchwood Casey synthetic for inside moving parts.
those flat springs stay put unless some one loosened them to lighten the action or screw breaks.
I am shooting a Winchester made in 1880, but not scene last Friday mostly shoot 5.5 gr.Trail Boss, but some times full black powder loads.
There are several You Tube videos on disassemble of the 1873, unless you think you want to get the entire trigger assembly apart they are simple and straight forward
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