DAO parts for S&W J Frames

[HRT]

I've got a couple of S&W Model 60's and would like to convert one to DAO by bobbing the hammer and removing the SA sear. Does anyone premanufacture this type of hammer or am I on my own (or the gun plumber) for this mod? I am comfortable pulling side plates swapping rebound slide springs polishing the slide and the like. I looked at Brownells on line and could not find anything.