just bought a set of weinmann deep v's on CL and the guy i botught them from told me that they were flip flop hubs fixed/free. i go to put on my freewheel and both sides have stepped threading. i thought stepped threading was only the fixed side? he swears they are fixed/free but to me they look fixed/fixed. can i put a freewheel on stepped threads? how would i tell which side is which if it is fixed/free?