The Verto/diaphragm flywheel puller is a specialist hand tool designed to remove keyed or taper‑fit flywheels and magneto rotors from small petrol engines without damaging the crankshaft taper or surrounding components. Its primary use is safe, controlled extraction of flywheels on motorcycles, scooters, lawnmowers, chainsaws, outboard motors and other small engine applications where the rotor is pressed onto a shaft or located on a tapered bore.

This Draper Tools Group D item (DR19862) is manufactured from chrome‑vanadium (Cr‑V) alloy steel and heat treated for toughness and wear resistance. The working surfaces are finished with a black phosphate coating to give improved corrosion resistance and to reduce galling when the tool is in use. The puller employs a central hexagonal forcing screw with a forged thrust tip; the screw uses an ISO/DIN metric thread form (metric coarse thread in line with ISO metric thread standards) and is driven by a conventional 12 mm hex for use with a ring spanner, socket or ratchet—no special drivers are required.

The tool’s clamp or jaw arrangement is configured to engage the rotor or flywheel securely; depending on model, interchangeable arms or adaptors allow use on a variety of diameters and engagement points. Manufacture and testing are carried out to recognised hand‑tool and screw thread norms (referencing common DIN/ISO/BS practices for metric threads and hand tool safety), ensuring compatibility with workshop procedures and equipment.

Typical users include motorcycle and small engine repair workshops, agricultural and grounds‑maintenance technicians, marine engineers working on small outboards and industrial maintenance teams who service compact petrol engines. Key benefits are reduced risk of damage to engine components versus improvised extraction methods, durable alloy steel construction providing the strength required for stubborn fittings, and the black phosphate finish that helps resist corrosion in workshop environments. The metric thread and hex drive mean the tool fits standard UK sockets and spanners.

Duchy Fasteners stocks Draper Verto flywheel pullers and related adaptor kits in a range of common sizes and pack quantities; individual tools and workshop kits are available—please contact us for current sizes and stock levels.