I have used a polished up Ball peen hammer and eventually Bought an Osborne Cobblers Hammer the cobblers hammer has a much more pronounced crown and while could have been polished better for the price. Once I polished a small nick off the head it works great and no fear of leaving a small smiley face that happened occasionally if I wasn't extra careful. Whit all the work you put into a project it isn't worth saving a few bucks using the cheaper hammer. I have multiple hammers in my shop and the only 1 that hits leather is the Cobblers hammer.