WBT NextGen RCA female w/Eichmann RCA male?

i had recently installed WBT NEXTGEN'S. i contacted WBT thru a email on this subject. they had emailed me back and recommended their rca's. i have used their's as well as eichmann's and others with no problem with at least making a connection and music playing. i guess if it connects and works then anyone's rca should would work with them.
their response was a technical one on why one should only use their's. i believe they were concerened with the way the other manufactures make their's, and how far the center post would push into the WBT'S female rca.

Thanks for the responses. I had read somewhere that the Eichmann male could do damage to the WBT NextGen RCA female?

Thanks Tvad,...yup...that's the info I had read at some different site. Dang...another attempt at SOTA that has interface problems....