Allen Swivel Jammers


Dual Arm Mainsheet Jammer


Allen Dual Arm Mainsheet Jammer


Dual arm mainsheet jammer.

Allen have spent many hours of research and development with various boat builders to perfect the angle and height of the cleat to optimise mainsheet jamming.

  • Innovative light weight construction.
  • Dual ball race for maximum efficiency.
  • Optional click stops limit swivel rotation.
  • Line snags virtually eliminated.
  • Standard and high cleating angles to suit all.
A groove had been created in the arm for the location of the ball bearings;
this design prevents the lateral movement of the arm, significantly improving
the play and friction associated with traditional jammers of this format.
See diagram.

For use on:-
Etchells, Fireballs, sportsboats, SB3, Finn


Part Description Fix hole
size mm
Centre mm
Max Work
Weight gm RRP
AL-5166-DUAL Dual arm with lower cleat M5 19.5 x 19.5 600 513 £269.65 EACH
AL-5166-DUAL-A Dual arm with lower cleat & AL-2160 ratchet block M5 19.5 x 19.5 600 620 £348.52 EACH

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Burnham Business Park,
Burnham - on - Crouch,

Phone - +44 (0)1621-785455
E mail - info@proboat.co.uk



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