29 these generally are at a common fixed distance as between adjacent ridges that said embodiments of the present invention envision connecting to a variety of profiles in wellheads 12 that are commercially available or will be available in a manner that better distributes stress and contact forces as compared to currently available connector designs that emphasize a mirror image of the wellhead pattern on the collet that engages to it thus reference to teeth or engaging surfaces is not intended to be limited to particular existing wellhead patterns rather such references relate to designs of interacting multiple surface assemblies that engage each other to attach a body such as a blowout preventer body to a wellhead referring now to fig4 the initial contact is by surface 46 on surface 48 at that point there are preferably gaps 50 52 and 54 that are progressively larger as they are positioned closer to the upper end 56 of wellhead 12 as the collets move radially to start to apply preload fig5 illustrates that gap 50 has disappeared while gaps 52 and 54 still exist further radial movement of collets 19 shown in fig6 shows only gap 54 remains finally in fig7 all the gaps are gone as the radial movement of the collets 19 is finished one reason this happens is.