Thaine, Nice looking Sedgley, and well worth a restoration. I did a patch on an 03 a while back that had a Weaver side mount.It took a while to get the patch right but in the end it was worth the effort.
This is how it arrived, a total mess from the broken forend tip to the white line recoil pad.
The first thing I did was square the cut-out and clean the surrounding area. I would have had the receiver screw holes welded before the patch but at the time I couln't find a welder to take on the job. (May-be a good topic for another thread).
Next, I had to find a patch that closely matched the grain and color of the stock.
Work the patch until it fits the cut-out and contour of the stock. Notice the patch extends fore and aft of the cut-out, this will hide where the end grain of the patch butts to the end grain of the cut-out.
Before glueing do a dry run and make sure you have everything you need, this way you won't have to scramble for and extra clamp like I did!!!!.
Inlet the metal to the stock, then file and sand until everything looks right. Be sure not to get the patch to thin while sanding (like I did) or the end grain to end grain will show through. I had to remove the patch and start over. Dan.