<tonyrenshaw268@gmail.com>
>
> Gidday,
>
> I=92m stuck and was hoping someone could resurrect my momentum. I need
to know how long to make my instrument panel studs to accommodate a
washer, possibly conical, and probably only on the cockpit side, as the
other side should use either metal or phenolic washers. This means I am
having permanent studs out the back of the panel, going through the
firewall, and being secured on the engine compartment side of the
firewall.
Tony=85to get the benefit of vibration isolation, the SS 1/4=94 dia.
McMaster-Carr vibration damping sandwich mounts do the trick=85much
better IMO than any kind of a thru bolt...see cat. pg.:
http://www.mcmaster.com/#vibration-damping-sandwich-mounts/=r882gh
...photo below shows the male threaded stud each side, and there is also
a male / female style, 3 of which I used on the picnic tray STBD side
along w/ SS machine screws and finish washers.
I found the 1/2=94 long studs to be just long enough to penetrate the
firewall and to have room for a washer and stiff nut. Although a
stickler will notice that I lack the requisite visible threads beyond
the face of the nut, I do not consider that to be critical in this
instance.
Fred
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