I used 185 units for a lot of years and then ( and now) used 295 units. Here is picture from operator manual for the 185 unit. 295 units are the same as 185 for pressure spring and parallel linkage of the unit. If you are referring to the hook-like devices on the front of the unit, they are merely pieces of steel rod . Bent into shape and flattened on one end with a hole drilled through the flat and another hole drilled into the rod for a small split spring pin. Would be simple to make if you have one for a pattern. If soil is relatively loose or soft , yes one spring will keep the unit in the ground.