Thanks for the reply, dsb.
The problem is that leaving it the way it is now is causing the brakes not to work properly, prolonging the distance it takes to stop the bike - if I don't use the front brakes. I would live with it if the right arm was slightly lazier than the left but I mean it hardly moves at all and it's really bugging me.

I actually tried bending the spring but maybe the thing is too out of shape to work as it should. I might try some grease but don't have any bike-specific grease but have grease for general stuff.

I