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The original trim washers used by Porsche are not readily available (except from Porsche suppliers at a few bucks each) and were more countersunk with less flange than what you'll find available in the general marketplace, however we use the modern alternative as they are very close.  One thing that I will disagree with above is the use of screws vs. machine screws.  In the interest of long term serviceability we try not to screw directly into fiberglass whenever we can.  It works well initially, but these holes directly through glass are also easy to burn out and will "waller" out over time, especially if the door panel is removed a few times or someone isn't careful. Thus I would recommend using a nut insert.  The aircraft rivet in style are better than a rivnut, but even a rivnut is better than nothing.  #6 or #8 both work fine.  Countersunk machine screws with a raised head.  The look will be very similar to those in Gordon's link.  Washers are upholstery countersunk finishing washers in a matching size.

There is still a little debate, even within the restorers, about what is correct in terms of phillips vs. straight slotted.  General consensus is that Porsche stopped using the straight slotted and went to Phillips in 1956, however there are several original service manual instructions that reference some phillips pre-56 and some slotted post-56, so we just use phillips on the Speedster as it makes more sense all round.

The ones we use are shaped like 2 overlapping figure 8's with the threads in the middle and spots to rivet them in place with countersunk small rivets (1/16") on the outer ends.  They can be mounted on top or underneath of your surface, depending on your application, but obviously are stronger when you can mount the underneath

@chines1 posted:

The original trim washers used by Porsche are not readily available (except from Porsche suppliers at a few bucks each) and were more countersunk with less flange than what you'll find available in the general marketplace, however we use the modern alternative as they are very close.  One thing that I will disagree with above is the use of screws vs. machine screws.  In the interest of long term serviceability we try not to screw directly into fiberglass whenever we can.  It works well initially, but these holes directly through glass are also easy to burn out and will "waller" out over time, especially if the door panel is removed a few times or someone isn't careful. Thus I would recommend using a nut insert.  The aircraft rivet in style are better than a rivnut, but even a rivnut is better than nothing.  #6 or #8 both work fine.  Countersunk machine screws with a raised head.  The look will be very similar to those in Gordon's link.  Washers are upholstery countersunk finishing washers in a matching size.

There is still a little debate, even within the restorers, about what is correct in terms of phillips vs. straight slotted.  General consensus is that Porsche stopped using the straight slotted and went to Phillips in 1956, however there are several original service manual instructions that reference some phillips pre-56 and some slotted post-56, so we just use phillips on the Speedster as it makes more sense all round.

When I noticed a couple of those trim screws were missing from my 968 I searched everywhere and the closest I found were at Au-Ve-Co. I had a dealer in Las Vegas that would let me look through their huge catalogue, and I bought a box. (of 25 IIRC.)

Depends on how "authentic" you want the car to look.  I built my car way before I had the advantage of this site's "brain trust" and I didn't like the look of a bunch of screws holding my door panels on, so I used modern door panel clips, so no screws are showing.   It was only later that I realized that Porsche used screws.   🙄

https://www.amazon.com/Ford-Pa...gid=pla-568336538584

I don't think that anyone has ever noticed that my panels are screw-less, even though I, personally, may have a few screws loose.

Whatever floats your boat.

Last edited by Gordon Nichols

Depends on how "authentic" you want the car to look.  I built my car way before I had the advantage of this site's "brain trust" and I didn't like the look of a bunch of screws holding my door panels on, so I used modern door panel clips, so no screws are showing.   It was only later that I realized that Porsche used screws.   🙄

https://www.amazon.com/Ford-Pa...gid=pla-568336538584

I don't think that anyone has ever noticed that my panels are screw-less, even though I, personally, may have a few screws loose.

Whatever floats your boat.

It’s not just about authenticity. As Carey mentioned, the originals have softer edges that won’t cut into the interior material.

It’s the same with proper carb/manifold nuts and locking copper exhaust manifold nuts. There’s a reason Porsche used that specific hardware.



ps: You nave mad skills to be able to line up those clips. I could never do that in a million years.

Last edited by dlearl476

Hmmm. I wonder if it makes a difference. I’m reasonably sure the the box I got fro Au-Ve-Co are solid copper. I’ll take file to one next time I’m down at my storage.


ps: The first time I mentioned Au-Ve-Co I forgot to mention the good news. When I first discovered Auveco back in the 90’s, you had to either go to a distributor or order them through a body shop with an account. (I totally stumbled on them by accident because the distributor in Denver was right next door to the Kennedy Tool Box warehouse where I got my replacement boxes after my garage was robbed)  

They have a website now and you no longer need an account to order bits and pieces online.

https://www.auveco.com/

Last edited by dlearl476
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