I know the guy who makes these, He's a friend in the Alpine club called Trevor Hibdige, there's an article on Holbay's by him in this months Cut and Thrust.
He's a decent chap and i've got a set of his silicone gaskets to try in my holbay.
I've not seen these before, but I have to say I've not had any issues using the paper gasket on the ali cover. They are £1.50 from the club, so I think I'd rather stick with them; not saying those silicone gaskets might not be a 'for life' solution, but seems expensive to me . G.
Silicone Gaskets
Posted - 14 Dec 2016 : 08:26:54
. G.