If this is the older model with a #11 nipple then a slotted breech plug, I use my CVA Staghorn breech plug removel tool. Even though I bought my Wolverine new, it never came with a breech plug removel tool.

http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=396255

I think a person could make one out of some bar stock if they had a machine shop around them. There really is not too much too it. I like the CVA because it is much longer and I can by pass the scope with the longer one.