Rick, my '56 Cub, '57 Cub (Rusty), and '60 Lo-Boy all have the closed loop type. Actually I have never seen (or noticed
) the open loop or hook type.
'60 FH Lo-Boy
'57 FH Cub "Rusty"
C-3 mower, FH Woods 42F, 54A blade, L-54 blade, 194 plow, FH L-38 disk, FH LB disk, 144 cultivators, FH platform carrier