I've got this one:
http://www2.towerhobbies.com/cgi-bin...?&I=LXFT98&P=0
The picture shows the back, the other side is similar to the pink one but with a smaller hole. It seems to work fine for the rounded Harry Higley prop nuts. I've just discovered one problem though, I can't get the bu%%er off the starter cone... maybe the pink one is more flexible....