4mm scale return cranks for Romford/Markits driving wheels. Machined in stainless steel, they screw directly into any Romford or Markits driving wheel pre-drilled and tapped 10BA. The crankpin has a machined hexagonal end onto which fits the crank arm with a machined hexagonal hole, allowing variable positioning of the arm. Locked in place with a flanged screw. No soldering required. 14BA nut spinner needed for assembly. LMS type with 5.5mm throw and plain little end.
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