It would help to know what tool you have now.
The one I have has a die set for other things:
http://www.powerwerx.com/crimping-to...ping-tool.html
but I'm going to doubt it will work with your tool.
OTOH, buy the new one. Figure 40 crimps a year, year 1 its a dollar a crimp. By year 5 you are under 25 cents a crimp. Loan it to the three teams in your area to use and soon you are at a penny per crimp.