Dell laptop power cable always falls out!

"The cable one day happened to end up such that it came out of the laptop, then went at a right angle and from there off the table.

It used to go straight out of the laptop and off the table, and regularly fall out.

With the new arrangement, it has never fallen out!
So this accidental low-tech arrangement seems to work very well."

Cut 1mm from the width of brown tape, wrap it round the nearest end of the connector, cut off any excess. Should add that extra bit more to make it a tighter fit.