I did one a few years ago with no difficulites. There are two schools of thought here & I used the later.
The first, and probably the best is to inlay a piece of brass in the wrist to mount the site too. They you drill and tap it and mount as you would with any other single shot.
The second, and the one I used with excellent success, was to mount the site to the wrist with wood screws. you will need to find the appropriate size wood screws and usually rework the heads slightly so they look like the belong and then either cold blue them or fire blue them. You will need to remove the stock bolt (and buttstock) so you do not drill into it when drilling the holes. I found there was more than adequate thickness here for the screws to hold securely. You drill your holes, run the screws in to "thread" the wood, remove them and then grind off the tips to make room for clearance for the stock bolt as the screws are most likely got to be too long.
Shot the rifle for a year or two with ZERO issues, sold it to someone down south, when I moved to a Roller, who I am assuming is still shooting it. To the best of my knowledge the other owners never had an issue either.
A couple of things to rememeber, with the auto ejectors (if you gun has one) you want to make sure you hand is over the back of the barrel when you open it or, if you are using a longer staff on your site, you are going to ding it up when the brass come clanking off it. There are some instructions in the net on how to deactivate this feature. I never did on mine as it seemed like more work than it was worth. Also folks will tell you mounting the site like this is not sturdy to which I say "if you hit the site hard enough to pull the screws out or spit the wood than you are going to pull out the insert or damage the site also if it is mounted to an inletted plate.
Just one old guys opinion....
DonT
