I do it all the time in my gunsmith shop and it is extremely easy to do on any muzzleloader that uses a drum that screws into the side of the barrel and has the nipple screwed into it ! The CVA, Traditions, Jukar and a lot of the Spanish made rifles and pistols can be converted ! First, remove the barrel from the stock, then take vise grips and clamp on the drum that is screwed into the side of the barrel and place the barrel in a vise and protect it with a piece of leather , then unscrew the drum from the barrel and set aside . Next, you will need to put in a touch hole liner the size of the drum screw threads. You can order the touch hole liner for under $10.00 from any muzzleloader builders supply online ! I think the cva takes a 6 or 8 mm size ! Screw in the liner all the way flush with the side of the barrel and replace your percussion lock with a flint lock lock ! You can find used cva locks on ebay for $75 to 150.00 ! Or you can get a replacement small maslin style lock for $150 . That is all there is to the conversion ! You can also go to tractor supply and take your drum and measure the threads on their thread gauge and purchase a bolt the same size. Drill a 1/8 inch hole through the end of the bolt all the way past the threads, then cut the threaded portion off about 3/8 inch long , cut a slit across the face of the threads so a screwdriver will fit it, and screw your new made touch hole liner in your barrel! I convert every percussion muzzleloader that I can to flintlock to save on money and make them more reliable !