MOTM

What is the secret to making a MOTM power cable with the MTA-156  
connectors? Do I need a crimper to attach the wires? I try to get them  
in there with a set of pilers but that doesn't work. Last time my  
cable didn't work so I just blobbed molten solder on there to close it  
up. There must be a better way. Are you supposed to strip the wire  
first? I'm using 18 gauge wire.

Thanks, -jl