Elsewhere on the forum, I have explained my problems with posting photos here, so I am unfortunately unable to show my solution to the cowl-fastening annoyance, a pair of high-quality chromed spring clips.
When I say "my" solution, I exaggerate. The pioneering work was done by an English Morgan dealer, whose motto is apparently "Never knowingly under-priced". You can see his work in the General Photo Gallery.
I asked him for a quote. He said he was out of stock at the moment, but it would be £275 plus VAT (plus postage) for a set of four. I sent him a reply saying that I would get back to him if I unexpectedly find that I have an extra arm or leg...and he replied,"Excellent".
I found exactly the same clips advertised on the site of Vintage Supplies Ltd. I decided I need only two, as the rearward Dzus fasteners have never caused me any difficulty. The pair cost £53.28 delivered, plus a few euros for chromed nuts and bolts.
It was very hard, fiddly work and I hurt my back doing it and also lost some wing nuts down in the footwell. But it was worth it. Looks good, works well.