The tightness of the IEC socket going into your amp?
Having previously paid more than I should have, I bought one of the DIY mains leads, can't remember if it was Mark Grant or MCRU,but recently borrowed a quality aftermarket mains lead and noticed it was a lot tighter fit than mine, unfortunately I couldn't detect any improvement in sound, but did like the way the socket fitted into the amp so I bought a 'Hifi' IEC socket to connect to the DIY cable.
Is it better?
Possibly a tad, so just wondering if the tightness of the connection does make a difference?