In the Summer of 1977 I bought an AD Inter 10 with a dream of touring the western United States. To prepare the bike, I replaced the stock hubs, bottom bracket bearing and petals with Phill Wood components, and added a Shimano GS extended cage derailleur. I never acheived my dream, but I also never regreted the purchase. The last time I had it in the shop for a tune-up, the owner asked if I wanted to sell it. Is it really only worth $200 on ebay? If so, then I think that I will take Manfred's advice and keep it for another thirty years.