The first thing i do is locate a butt plate i like and i will make a pattern of the top and of the butt section by wrapping a piece of paper over rhe top and tracing around it with a pencil and i do the same on the butt section, this gives you a good pattern to transfer to cardboard or alunimum if you want a wider butt draw it wider or if you want more curve it needs to be wider . make a center line on the inside and outside of the parts this helps when forming
i saw it out of 1/8 steel and i shape what curve over my swage block by usind a piece of shafting on the inside of the butt and using a hammer to drive it in the groove in the swage, i shape the curviture and then the cresant part ofer a large dish in the swage block hammering on the outside of the butt till i get the cresant shape i want. a lead hammer is handy here.
i form the top the same but use a piece of 3/4 shaft to drive in the inside , i then check to make sure its formed the way i want i then try the top and see how it fits to the butt.
if every thing is good i hold it with welding magnets and spot it with a wire feed welder if all is well i gas weld it with a torch or it can be brazed on the inside for a more traditional way.
Now check that it is not twisted from welding i f so twist it back i a vice.
i then grind the inside of the top and the butt to get it level on the edges cause when you bend it it will have a sharp edge on the metal.
grind the inside where you welded it with a dremal tool,or die grinder, do the same on the outsibe to blend the top and butt where it is joined
Inlett it to the stock in the same way as a factory one, if its twisted some it requires a little more work to inlet or a little tweeking in a vice, work slowly.
you can bet i will use the welding jig described on the next one!!! I hope my directions arent too confusing