[2426]. Hook centre pin, easily disengaged.

[2427]. Stud centre, with washer riveted on or secured by a nut.

[2428]. Ram or trunk piston centre for connecting rod, fastened by an internal nut.

[2429]. Ram or trunk piston centre, screwed into the piston.

[2430]. Ram or trunk piston centre, with a transverse pin passed right through the piston.

[Larger plate.]

[2431]. Swaying ball centre.

[2432]. Rocking or swaying centre.

[2433]. Rocking or swaying centre.