Hegel fuse holder


Asking to see if anyone had upgraded the fuses in their Hegel integrated? I’m trying to open up the fuse box, but this thing is jammed shut, so maybe I’m missing something...there’s a flap I see to open it, but it won’t seem to budge.

Any ideas on ways to open this? I imagine someone had trouble installing new fuses and had a workaround.
cd45123
Ok, got the SR Orange in. What's the deal with the grey charcoal looking circle in the middle that they tell you not to remove?

I think I have it in the right way with SR facing left to right when inserted.


I also have a Hegel, and would like to see a video, how to open this little door, without breakin the plastic cap, and al;so to see the correct direction of the "orange fuse" how to install into the fuse holder ?
My Aurender has the same fuse holder thingie. I had a difficult time opening it but the Orange fuse made a significant improvement although it takes over 100 hours to break-in. 
I've a number of Synergistic Research products including cables and resonators. All worthwhile even for a guy with a limited budget like me.