Jack, If you have an arc welder I bet you could do it. Get an old piece of cast iron and practice. There's also lots of videos on how to do it. It's not as difficult as it may seem.
Peen with ball peen hammer to relieve stress as it cools down.
https://www.lincolnelectric.com/en-u...t/not+provided
and
http://www.thewelderswarehouse.com/b...ing-cast-iron/
and finally
https://www.youtube.com/watch?v=0IkpAsNDbOo