Of, course......I've used the DGW cams for many years, and posted several times regarding it. Cheap and relatively easy.
DGW used to sell two sizes. They dropped the smaller size from inventory. It perfectly fitted my old Piettas.
Several of my older model C&B Colts had a replaceable cam in the as-built condition. In others, I've modified myself, using a grinder (grind off the worn cam) and drill press to place the new hole. So far I've retrofitted two Pietta 1860's, two Unberti 1860s and one Uberti 1860 RM with the new cams.
Simple to do. I've never used a "jig". Just a good eyeball spot and tap with a center punch after grinding the old cam flat. Once the hoel is drilled, grind off the remaining cam. Using just the "large" version cams available today, I've had to modify the cylinder stop (aka "bolt") to work with the larger cam (reset feature). If I had a lathe, I'd likely dress the cams down to the old size. Either way works. If ya make a mistake, can always buy a new hammer & bolt.
Slim