Hi John and Mark,
My measurements today on a B36/2002 tie in pretty much with Mark's, maximum thicknesses, and varied from 46 to 53mm depending on where it was measured, and I checked in several places between one gunwhale and the other. I guess this is may be down to slight variations in the lay up of the flanges joined together under the rubber or perhaps in the amount of adhesive originally used. A friend has a 37(2001), and he had to have his resecured, but had it done for him and does not remember what adhesive was used.