tool to expand female RCA terminals?

Greetings everyone. I friend of a friend gave me a pair of 1.5M RCA Interconnects from a company called Harmonic Tech. I went to use them and found that the female RCA connector is too tight to fit onto any of my male connectors, I tried several different pieces of audio gear. The female ends are so small, I do not think putting dielectric grease on will help, and I fear that I will end up pulling the male RCA's off my equipment when I go to remove the interconnect cables.

I contacted the company and they are no help at all, want me to buy a new set of female RCA's for $200 and mount them myself.

So my question to all of you is this: is there a tool or method to expand the female RCA terminals so that they will fit onto standard sized male RCA ends? I have tried inserting one female end into another, that is, using the center positive part to try and expand the gap between the center post and the outer part, but that did not help.

Thank you for your help.
 
Some of the Harmonic technology rca cables are terminated with Locking RCA, if the rotating barrel jammed, try use pliers to loosen it.
Screenshot 2024-06-11 at 10-04-26 37572-6__31983.jpg (JPEG Image 732 × 350 pixels).png
 
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Some of the Harmonic technology rca cables are terminated with Locking RCA, if the rotating barrel jammed, try use pliers to loosen it.
View attachment 1320817

Yes, I noticed that you can unscrew the top part of the female connector, but that did not seem to make any difference. I will unscrew these and then try and use some needle nose pliers to expand the four inner pieces so that they can fit over a regular male RCA. Thank you.

What do you think of these cables in terms of sound, I mean, are they worth trying to fix?
 
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