LOL! You can insult me I don't mind.
Yes I'm using a crimping tool. I should point out it's one of those ebay kits: crimper, rj45 heads, tester, cutter etc. all for 8 quid!
What through me is the first attempt only 2 pins didn't light up on the tester - so I thought that's not bad for the 1st attempt
2nd attempt zero lights! ; not one ! - I'm thinking but surely you would expect at least 1 pin to make contact!
So I'm going to go against the moto and blame the tool. There's just no way (I did 15 today!) that I'm going to get it so wrong that many times!
Push thru crimper will be ordered!
Will report back with hopefully 100% success rate. But agree with @JSHarris that as a few wires have to 'cross' over others must cause some issues.