in fig4 a nut or similar stop member 50 is threaded onto the distal end 28 of the bolt 22 and rotated until it is adjacent the stud engagement portion 36 of link 32 if the walls 44 forming the hole 38 are spaced too far apart so that the edges 44 cannot be counted upon to engage the body portion 30 of the stud 22 the nut 50 can be relied upon to intercept and engage the link whenever the bolt 46 is manipulated to draw the stud downward and engage the sink flange 20 onto the countertop it may also be preferable to use the nut 50 regularly in combination with the rest of the clamp elements shown in fig1 3 due to the fact that manipulating nut 50 can positively position link 32 and bolt 46 on the stud 22 to take up any slack in the chain of elements and insure that turning the bolt 46 accomplishes a secure flange engagement on the upper surface of the countertop rim portion a further embodiment of this invention is shown in fig5 in this figure the sink flange 20 the stud 22 and the countertop rim portion 12 with upper side 16 and underside 18 are the same elements.