most hardware stores have a nipper blunt nose wire cutter that will work fine for pinching the rings. but you do not crimp the ring to align the holes with the tab, you wrap the ring around the boot, and hook the tab into a hole as tight as you can, THEN crimp the ring to hold it firmly onto the boot!

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!