We had a quick email exchange on this subject with Urs few years ago:
From: Urs Schmid
Sent: Monday, June 8, 2015 1:28 PM
To: Tadeusz Malkiewicz
Subject: Re: Question on rear welting for the rear wing and the shut face
On my 22000 mile 120 OTS the original welting is still there. Your description corresponds to it except for the tube. It’s core does not consist from rubber but from cord which is wrapped by Rexine with rubber backing, the rubber being glued to the cord. This sort of gasket is called “Rubo” gasket. The gasket was overpainted in the colour shade of the car but the colour breaks by aging and usage so that on many original cars just the the black rubber/cord tube rests.
Hope this helps
From: Tadeusz Malkiewicz
Sent: Sunday, June 07, 2015 6:49 PM
To: [‘Urs Schmid’]
Subject: Question on rear welting for the rear wing and the shut face
I am so sorry to bother you, but I am wondering whether you ever had a good look at the welting for the rear wing on the shut face. I am trying to find the correct material, but I’m a bit lost.
I understood the welt is constructed as follows:
- a 5mm sponge rubber rod on the inside
- the rod is surrounded by a canvas material with rubber backing the thickness is a little less than 1/4’’.
- the canvas in on the outside (rubber backing on the inside) and is painted body colour.
- the length is less than 2 ft.
This welting appears in 2 places in your book (page 230, vol 1), (p.52, Vol 2).
Could you possibly confirm if my assumption is correct?