One more thing to consider is that leaving the spacing at 120-122mm and just spreading for a 6-7 freewheel hub tends to bend and break axels if the dropouts are not aligned for the wider spacing. Mostly a problem for old freewheel hubs as the DS bearing sat closer to the center than on cassette hubs. If you choose not to do a cold set I would stay away from 126mm freewheel hubs.