How to secure a large power cord to a piece of equipment?

Plug too loose, wrap it with a layer or two of black duct tape,

Plug too tight, sand/file/shave the plug to fit in fully

Cord too heavy: you need a place to attach a string/twistie/... and carry the cord’s weight. A string or twistie from a screw on the unit, or a nearby heavier unit. a small hook in the rack or windowsill or the wall behind, string tied from hook to cord. Think easy removal.

My Ortofon Phono cord is quite heavy, I support it’s weight via a hook just behind the plinth.

My Cayin power cord is heavy, but it is on a separate cabinet, I am able to simply push the cabinet back just enough that the cord is held in by pressure from the wall behind. I am able to position the amp anywhere front to back on the cabinet to make that work.

I have to admit I would be very concerned in getting a high end power cord that does not fit snuggly. This is one of the characteristics that goes up in high quality power cords. I would return it.

The best sounding power cord I have purchased. Audio Quest Hurricane, is so tight (I have more than one) that it takes a tremendous effort to get off and on. Not because of the outside… but conductor contact. I am sure this is one of the parameters making the cord sound so good. Although all of the high quality cords I have purchased fit snugly at least.

You can check Furutech's NCF Booster, enhancer and cable holder.