hook 20 the small bend at the end of the wire form end 42 prevents the spring 40 from disengaging from the dogging hook 20 the opposite end of the spring 40 contains a long loop which serves as a handle for installation as well as a positioning aid because the load of the spring 40 is highest when the dogging hook 20 is in the center of its travel the dogging hook 20 in unstable which results in the spring 40 biasing the dogging hook 20 in either of the engaged or disengaged positions the dogging hook 20 has a center aperture 24 with an engaging keyway 26 extending therefrom the combination of keyway 26 the shape of the dogging hook 20 and the dogging adapter key 74 only allows the dogging hook 20 to be assembled onto the dogging adapter 70 in one way thereby preventing incorrect assembly because the control rod 14 may have several operating positions the hook portion 22 is contoured to form one or more steps which allow the dogging hook 20 to engage control rod 14 in a plurality of positions the u shaped spring clip 50 contains bends at the free ends of the spring 50 that form retaining heads 52 these retaining heads 52 cause the u shaped spring clip 50 to retain itself in the dogging adapter 70 after the spring 50 is installed into the dogging adapter 70 the curvature at the top of the retaining heads 52 allow for easy insertion of the dogging hook 20 and the hex shaft 30 the flats approximately right angle surfaces at the bottom the retaining heads.