Erik, you have to check the length of the pins and compare them with aftermarket ones like Furutech or similar. Speaking of Furutech all of their iec plugs give a tight fit in my experience. Other iec plugs that have a good fit are Iego.
Can an IEC socket be too short?
I recently replaced the female end of my custom power cable because the previous plug seemed to not be very tight. It was super easy to cause my Luxman integrated to lose power with just a little motion (1-2 mm).
Well, the new plug does exactly the same thing. So now I’m wondering, is it possible for an IEC socket to be too shallow, or have pins that are too short? Or could it be that because the equipment lacks a ground pin I’m missing grip strength?