I agree with makeinstall. The first thing it says it 'purchase a high quality crimping tool', but it shows the cheapest one available, and having used one, I can see why they say you need to buy more connectors than you need! I make lots of cables up, and I never have any problems when using a good crimper (unless I screw the wiring order up because someone gave me a cup of coffee half way through!) Also, the video doesn't show the actual insertion - probably because it took ages. The ends of the strands need to be straightened (by running them through your fingers) just above the last twist on each pair (keeping the twists equal on each pair) to allow them to be inserted. Then trim the ends leaving just enough straight ends to insert. And the reason why the cable should be inserted into the connector housing is because there's a strain clamp to help stop the cable being damaged.
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