I am not really a "D" man, But I thought they didn't have a spring, What they had was as Gary said,
spring clip, Ft290
spring clip, Ft290
Danno, upon re-reading your description of the problem, it seems that you don't have the two FT290's.
As far as the brake arm touching the cable stop, just a slight bend in the brake arm would sort it and not be noticeable.
Just to make sure there is no confusion the part I am suggesting you bend is that part of the lifting handle that is causing the problem. No suggestion you do anything to the brake arms. If you take off the lifting arm and have access to a decent vice it will take only moments to move the offering bit outwards an eighth of an inch or so.