I'm trying to put a BSF B50 back together, but when I was stripping it I managed to let the trigger spring pop out before getting a proper look at where it's supposed to go. I've tried sitting the front end on the little bump up inside the fold of the trigger and the back end either on the tang of the cylinder block sleeve or butting up against the inside of the cylinder end block, but either way the spring just jumps free when the trigger is pulled.
Can anyone help?