I'm considering one of Brownells english made dent raisers, that's the type that uses hydraulic pressure on a shoe - for lack of a better term - to push the dent out from the bore. Reading Brownell's catalog, a watch out is to avoid too much pressure which can reverse the dent and bulge the barrel. I'd appreciate any comments by anyone on this board who owns one of these tools. Do you raise the dent slightly above the exterior surface of the barrel, then let it rebound? Or do you just raise it even with the O.D. and it stays there? Are there any tricks in using it I should know? Thank you.