Valves ?

[Sircular]

Hi peeps, I've been using right angled valve extensions, up until a month ago, when, after returning to my , had a flat front tyre. Reason being :- valve split, due to excessive forces caused by aforementioned extension. (AA man fitted a new valve. Filled tyre with air, ) & I was on my way. I'd like to know if anyone has angled valves fitted, & if so, where did you get ' em from? Thanks, regards, Sircular.