I'll agree and say it's a pain when you've got to crimp 2 thicker wires into the one terminal.
What i do is use the molex trifurcon crimp pins , you then get the 2 wires into the pin and do the first crimp.
I then apply a tiny bit of flux and put some solder onto the crimp i've just done to hold the wires firmly in there , then i do the second crimp over the insulated parts of the wire.
I've found that if you don't put the solder on the first crimp then when you do the second crimp the wires pull out of the first.

Have patience ,take your time and you'll get it done no worries

And may the force be with me 

thanks mate I'll give it a try. I have to do the same on the TZ connector to the 10 opto pcb. I'm getting weird switch matrix on row 7 when activating the clock target a lot. If I wiggle the plug a get bogus activations or row 7 lighting up. I panicked  thinking the cpu was stuffed again but I'll do the connector first to get that from the equation. Do you agree???