I'm in Norhtern Illinois. Have used Clark before, last year got a Model 10 turned into a PPC gun by their revolversmith, a beautiful firearm. Hoping to find something closer. America's Gunsmith Shop in Burlington WI is driving distance, and has done some minor work for me before. But they won't respond to email questions about this drilling/tapping. Will call them if nothing else turns up. Dropping off in person beats shipping, and they have quick turnarounds.
Thanks.