Anyone know what the rail rubber profile was for the Old UBI aluminum rails? Have been asked to recover an old one and during my look-over before giving a price, discovered that the balls are hopping off the rails with normal speed shots. Some of the rails are low, but even the ones that are spot on using a rail guide are lifting the balls. Tried my own set of new balls, still hopping. I have a feeling the rubber may have been changed with the wrong profile. Any thoughts?