Yes I undertand the caveats about headspace, end shake, barrel cyinder gap and timing. That said, is it possible to fit a new model blackhawk cylinder to an old model? I have an old model 357 and was thinking of fitting a 357 cylinder to it to make it a convertable. From the research I've done the new model cylinders are slightly longer. So no big deal to cut it back with the lathe and set end shake and barrel/cylinder gap. The bigger question is regarding the timing end of the cylinder and whether or not that will trip me up.