Cunning! I used a small triangle of 3mm double sided number plate tape to overcome the beading edge and it seems to be holding (mind it hasn't been that long since I decided to refit them after the cowl keeps getting churned up with rubbing)
Keith
Car 54 - 'Le Mans 62' 4/4 Supersport OxMog Member (and associated with CranMog and SwanMog)