Okay, here we go. Fitting a buttstock is not difficult if you are patient, have good sharp tools and a well carved/inletted stock to start with. As for sharpeness of tools, if your chisel can't slide thru endgrain leaving the surface looking like it was polished with 600 grit paper, its dull and you need to start by learning how to sharpen them up and strop the edges on a leather belt.
The old oversanded and broken and the new fresh and oversized for fitting.
With the tangs cleaned I check the initial fit, tapping lightly so as not to split the stock, its tight and the rub marks are carefully sliced away on the edges of the tang inlet with a sharp chisel.
I've sliced the edges of the inletting all the way along either side of the upper and lower tang, checking the fit, still a snug slip and time to polish the edges of the tang inlet with a file for the final slide.
The stock ears are oversize and need releaved to slide into the inside of the action. Don't take the ears off, they serve to position the wood in the action too.
Simply bevel the ears lightly as seen on the left and then lightly tap into place to check for rub marks.
At this point the fit is about right and note, the lower tang is damaged, bent downward, likely by a fall long ago.
Pull the stock and lightly pair away the rub marks on the ears to a light drive fit in the action...light drive is nothing more than taps from the heel of your hand.
The fit now is at least as close as original, a very slight gap at the rear of the upper and lower tang, it'll close with finishing and snug enough that NO glass bedding will be required....simple sealing with true oil and wax will see this stock well fitted for another 50+ years.
Total time invested -- 30 Minutes. Much less than the 5 to 10 hours needed for carving a stock from a blank and with time equaling money, a significant savings on a stock that cost $35 shipped.
Next step is to releave the inletting inside the wrist to clearance the mainspring sleeve and rod.
Oh yeah, I revised the shape of the lower tang, its straight and perfect now.
The old oversanded and broken and the new fresh and oversized for fitting.

With the tangs cleaned I check the initial fit, tapping lightly so as not to split the stock, its tight and the rub marks are carefully sliced away on the edges of the tang inlet with a sharp chisel.

I've sliced the edges of the inletting all the way along either side of the upper and lower tang, checking the fit, still a snug slip and time to polish the edges of the tang inlet with a file for the final slide.

The stock ears are oversize and need releaved to slide into the inside of the action. Don't take the ears off, they serve to position the wood in the action too.

Simply bevel the ears lightly as seen on the left and then lightly tap into place to check for rub marks.

At this point the fit is about right and note, the lower tang is damaged, bent downward, likely by a fall long ago.

Pull the stock and lightly pair away the rub marks on the ears to a light drive fit in the action...light drive is nothing more than taps from the heel of your hand.

The fit now is at least as close as original, a very slight gap at the rear of the upper and lower tang, it'll close with finishing and snug enough that NO glass bedding will be required....simple sealing with true oil and wax will see this stock well fitted for another 50+ years.

Total time invested -- 30 Minutes. Much less than the 5 to 10 hours needed for carving a stock from a blank and with time equaling money, a significant savings on a stock that cost $35 shipped.
Next step is to releave the inletting inside the wrist to clearance the mainspring sleeve and rod.
Oh yeah, I revised the shape of the lower tang, its straight and perfect now.