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I have successfully used 1/4" phenolic pads at mounting locations but I was
chasing a better finish around the edges.
To do this I laid up a 3 bid (I think) angle that followed the cowl mounting
flange and turned in over the Stainless sheet (this also hides the edges). I
then have nutplates attached to this, larger ones for the forward deck/cowl
attach and small ones in between to actually hold this to the fixed flange.
This angle effectively becomes a multi-nut nut plate in itself. The fibrefax
keeps the S/S tensioned from the back against the flange. Around the nose
gear cutout I have phenolic strips with some 6-32 blind nuts (Du-Bro model
aircraft bits) buried in the back of them before bonding. Make sure it is
drilled behind these nuts to allow for some extra screw length. I then screw
through the stainless nose gear cover plate, firewall stainless and phenolic
edge trim in one go.
I can now remove the Stainless and fibrefax at any time without ruining the
paintwork, no silicone around edges etc and the paint lines are all neat.
Hope this is clear and perhaps useful to someone

Graham Nutt