I've had cappers like that and didn't work for me. I hope your's will work.This is the capper Enfield58
http://rover.ebay.com/rover/1/711-5...0001&campid=5338413729&icep_item=332781975771
This is the nipple wrench. Traditions has another wrench that is supposed to suck due to the metal not being hard enough and it bends on the end.
http://rover.ebay.com/rover/1/711-5...0001&campid=5338413729&icep_item=232917431327
The nipple wrench looks well made but the one I have seems like it is made of soft steel. On the other hand, the nipple prick is a good idea.
I really like the ratcheting nipple wrench that I picked up from Cabela's as well as the Slix-Shot nipple wrench/combination tool.