I have an old 1988 steel Bianchi with a braze-on front derailleur hanger. I just put on a new crank, replacing a 53/47 with a 47/30 set of cogs. For the small ring, the front derailleur sits about 2 or 3 cm too high. Am I doomed, or is there a way to extend this? Unfortunately I don't think there is quite enough room simply to put a clamp below the hanger.