yep, the inconsistency is on the very tip itself.
stoney point sells a popular reasonably priced tool to do that, slv. sinclair sells some pricier versions
this is the one i use
http://www.sinclairintl.com/cgi-bin/category.cgi?category=RESDTSD&item=59-4000&type=store
http://www.sinclairintl.com/cgi-bin/category.cgi?category=RESDTSD&item=09-4X&type=store
(edit: i don't know what's up with the "new style" "old style" crap... but mine looks like the combination of the two pictures you see there... the rod with two stops on it, and the nylon slider that goes over the rod and has the little metal shaft sticking out the side)
stoney point sells a popular reasonably priced tool to do that, slv. sinclair sells some pricier versions
this is the one i use
http://www.sinclairintl.com/cgi-bin/category.cgi?category=RESDTSD&item=59-4000&type=store
http://www.sinclairintl.com/cgi-bin/category.cgi?category=RESDTSD&item=09-4X&type=store
(edit: i don't know what's up with the "new style" "old style" crap... but mine looks like the combination of the two pictures you see there... the rod with two stops on it, and the nylon slider that goes over the rod and has the little metal shaft sticking out the side)