Usually power cords are much too long.

You can get the replacement plug in a hardware store or on eBay for ließ than 2$.

While following this guide, keep the cable unplugged at any time! Otherwise you can hurt yourself badly!!!

Cut the cable at the preferred length

Use this part of the cable from here on

Slice open the outer insulation

Cut it off

Remove 1cm of the inner insulation

Take apart the replacement plug

Put the cable through the back end

Attach the cables to the plug. There is no right or wrong: one on one side, the other on the other side.

The little bridge will secure the cable

Close it up

Aaaaand: You're done - Before & After

Before & After

Works like a charm