I have a Concord Freedom Selecta 12 purchased in 1981. The bike fits like a glove and I've put countless miles on it. Unfortunately the crank has finally given out. I took the bike to a very reliable bike shop and was told they don't make a replacement crank. i.e they couldn't fix it. Anyone know where I could try to find the part I need? I'm really hoping I can still repair this one. Thank you.