Wow, you are having some terrific luck with that Sharps. Please post your progress as you work along. Sounds like we don't need to remind you to use great caution on those screws. You can still bungle them up if you get in a hurry. I personally hope you resist the urge to over-clean the carbine. Of course, you want to get any rusting arrested, but you know that.Wow, thanks for all the posts. I couldn't believe my luck when I was able to remove all the necessary screws to figure out what's missing.
First to come out was the linch pin. Wiggled a bit and the breach block came out, with the lever still connected. don't understand yet the mechanics of a percussion firing system, but learn I will.
Next came the lockplate bolt on the left side. Was way easier by way of removing all the crud in this/other screws with a nice razor blade. Cheap/strong regular screw driver blade made loosening the screws easy indeed - no stripping at all on the heads.
Thought I had to also remove the bottom screw for the lockplate to separate it from the barrel body, but oh how happily surprised I was when out of the blue it just fell off, safely on a towel.. That bottom screw had strip marks all over it, along with a hammer effect from the side that would have been an obstacle to freely undoing that screw.
The inner screw that kept the saddle bar stub (nothing left- this is survivor of a piecing-out effort) again came out wit relative ease, given 150+ years. This screw and the lockplate screw were the only pieces with bluing.
With the lockplate off, I referenced an eBay pic and knew the main spring was missing. Why the heck would that be? That "wishbone" spring is on order from lodgewood.
Stlll not sure what other part(s) I'm missing. Saw a "firing pin" listed on eBay as maybe that mechanical piece needed to be operational. I'll check schematics, and cross my fingers that that's the piece that fits between the nipple and the hammer.
A third part is missing, which bolts to the top of the lockplate. Mine has an exposed track(oddly bent outward/to the left). Again, schematics should guide me there. Attached is the view from the rear.
Oh what fun I'm having!