When I install gears to a single speed bike, I miss the "housing stops" on the frame. I adjust by using brake cable housing, running continuously from shifter to derailleur, which is not efficient in shifting. We usually use the long back brake housing of lady's cycle. So we need mountable housing stops (a set of 4) provided with this gear kits, 2 on top tube and 2 on seat stays. I am going to get this made from lathe and get it welded on frame, so that I can use 3-piece "shifter cable housing", not the springy brake cable housing.