I have a Marlin 1894 44-40 old model 399xxx. I had a shell separation yesterday. the rim came completely off & the rest of the shell is still in the chamber. I have had this in the past & used a shot gun bore brush with stiff bristles going into the chamber & removing the brass. This did...

Correction on my post. Those notches are on the lower tang or trigger plate. the piece that is inserted is curved "L" shaped.

Does anyone know an easy way of getting the plate on that holds the mainspring? I would like to get the plate to the first notch on the upper tang closest to the hammer but cannot get it done. any help or advice would be appreciated. Thanks! this is a marlin 336 from the '50's.