Hagon Question

After riding for a year with the 35kg springs I decided to try 30kgs They arrived this morning but look identical to the 35s. Rang Hagon who assured me they have supplied 30kg ones. They say the springs are marked on the flats on the ends (ie under the collars once assembled). This doesn't help anyone buying any second hand .... just so you know you may not be buying the standard 35kg springs. I'm going to find some way of marking mine so I can tell them apart
Mike