[lugerholsterrepair]

I agree with Ron's approach depending on the actual damage..Recently I was doing some work on a piclehaben German helmet and needed to expand a small 3" circle of steel. I went to Harbour Freight tools and bought a large size tail pipe expander for $12.00 It worked really slick! One good advantage was you could control what was happening... Most any approach has to be done with some caution. Too much whacking or expanding could cause unintended consequences.