Hello. I just bought a 2nd hand NCM London two days ago (which is only 8 weeks old) and it has an insanely stiff folding frame hinge. I have oiled it and it is a bit better but still very very stiff. Is there a mechanism to adjust this stiffness? I see a hex-bolt at either end of the frame hinge but am unsure if I should unscrew them. (I am new to bikes in general). Thanks, Colin.