Well let me start with the Mortite vs Armafelx,last week I took out the mortite from my 1.2tl's I shared all this in Ray's thread. as I was taking out the drivers and passives I wasen't very happy with the 8-32 SHCS (socket head cap screws) on the drivers I didn't like the width of the head and found that in some areas it was pulling the slots on the baskets. the diameter of the head is about .268
Yes I could put a washer behind it but I don't like the look of it on the drivers I had done that with the passives (more on that in a moment) so took some 8-32 BHCS (button head cap screws) the same ones I would send with the rings for your tweeters and passives the diameter of the BHCS is about .305 and replaced all the socket head cap screws, I find that you get a better fit with these screws.
Back to the Mortite for a second I really feel that the Mortite puts unnecessary stress on the drivers even with the rings when keeping things tighened down nice and snug.
Today when I replaced all the SHCS for the BHCS I got to see how the Armaflex is looking after being pressed down for a few days, I will say that the Armaflex looked just like the original gaskets when you pulled a driver or passive.
The Armaflex alows you to snug down the drivers and passives with ease. if one needs to replace an old gasket this is the stuff to use it is that good.
Now on to the Passives and 15" rings, Again I did not like how the screws were fitting up to the passives, the 8-32 BHCS even with a washer wanted to pull in. I know that some of this was caused from trying to snug down the Mortite but IMO I found that the 8-32 screws to be a little small for the slots in the passives, the slots are bigger then the ones in the drivers.
So I picked up some 10-32 BHCS the diameter is about .353 also the 10-32 is much better looking for this job. I also picked up a 10-32 tap and a .293 drill bit.
I drilled through the 8-32 hardware that was in the rings then tapped them out to a 10-32 as soon as you start putting back in the passive you know this was the thing to do. with the use of the Armaflex and the 10-32 BHCS you can snug these down as much as you like without worring about opening up the slot.
If there was room on the drivers for a 10-32 BHCS I would replace them all but the rubber surround keeps you from doing so.
I will see if I can use the 10-32's on the passive rings of my 1C's.
In short Mortite Sucks and is horrible on your baskets and hardware, and I recommend swapping out your SHCS with BHCS you get a beeter fit and it grabs more of the basket when snugging it down..