You and your "shiller" need to take a long look at yourselves and look at your own souls, don’t worry about mine it’s clear.
Pushing the non technical members here, some that can’t even change a tap washer, to open their their equipment up and go inside start playing around with mains fuses that could injure them or worse.
All because your saying they are going to find the "Holly Grail" of audio if they change their perfectly good 20c mains fuses and replace them with these $150 voodoo ones. More likely they will find the Holly Ghost instead.
There’s a reason they say this on the back of audio equipment, and it’s not for a joke mate.
https://ibb.co/TW8rbrJ