just to get this straight. i've read some threads stating that spacing a 120mm hub to fit 130mm spacing will prevent using both sides of a flip flop hub because the hub will be off center. this makes sense, but when searching for 130mm hubs, i find 120s that say "will fit 130 with longer axles and spacers". they don't mention redishing the wheel or making the free side obsolete. is it true that using spacers on the 120mm hub to straighten the chainline will leave me with only a fixed/no free?