The ring shaped, watch hand puller on the left is useful for pulling N and smaller gears. Although similar in design to large automotive pullers, the next one has not proven to be of value. The two at the right are inexpensive refugees from the slot car era. Built from soft steel, using 10-32 slotted screws, they are not very substantial. The left one was cut down to fit a special case.
Very useful and inexpensive is the NWSL Puller, with flat, cone or pin end 10-32 press screws. For light pressing the knob ends are sufficient, but the cap heads with Allen wrenches provide much greater leverage. Its two major drawbacks are its size and the soft aluminum bends under heavy pressure, even with the soft steel "accessory" plate. (Obvious by the top and bottom curvature of the tubing and the plate VEE spread, in close scrutiny of the picture.) A more substantial Chinese copy can be made from the same steel tubing used for the raised back plate above, utilizing the original parts.
The adjustable bar puller-press with spring loaded stop and 12-28 screw, is most useful for removing and mounting worms on motor shafts and many odd cases. Alignment is critical to avoid damage. Adapters of various shapes can be used in the stop slot or on the screw pin end.
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