I have a dent raiser like the Baker tool except mine was made by a instructor years ago at the Trinidad Gunsmithing School. Mr. Sam Hinson an old friend and Gunsmith gave me the tool about two years ago right before he passed away. Also he gave me different sliding blocks for 12ga, 16ga, and 20ga. I have used the tool and it works great. Also he gave me some expanding brass dent removing tools that can be adjusted for different bore sizes.
I really miss the old time gunsmiths that had been there and done it all. I guess you can't re-invent the wheel.

Regard
M.L.
Oklahoma Panhandle