Steel? Aluminum? Chrome? Paint? Natural?
Without knowing what material/finish, I'd offer in the general sense to use wooden implements, a wood underlayment and work from the inside. You can easily take a piece of hardwood dowel of the needed diameter and cut lengths, making different-shaped ends like 'ball', 'chisel', 'wedge' or whatever as you need them. A small non-marring hammer can come into play too.