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Mainsheet Jammers

Our range of mainsheet jammers from Harken, Allen, Selden and Ronstan are light weight, innovative and designed to optimise mainsheet jamming.

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  • U-Adapter Assembly for 3/8 Post
    Harken
    Price: £9.48 RRP: £10.53 | Save £1.05
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  • Light Weight Swivels Fork to Short Fork
    £9.53
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  • Light Weight Swivels Fork to Fork
    £9.53
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  • Stainless Steel Universal Swivel Base
    Allen
    Price: £10.38 RRP: £11.53 | Save £1.15
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  • Swivel Base Boy Fitting
    £10.68
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  • Stand Up Base, Suits S40 BB & RT Orbit Blocks
    Ronstan
    Price: £12.98 RRP: £14.42 | Save £1.44
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  • Stand Up Base Suits S55 BB and RT 55mm
    Ronstan
    Price: £15.73 RRP: £17.48 | Save £1.75
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  • Swivel Base to suit BB & RT Orbit Block
    Ronstan
    Price: £26.63 RRP: £29.59 | Save £2.96
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  • Mast Swivel RF5
    Ronstan
    Price: £39.87 RRP: £44.30 | Save £4.43
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  • 360 Rotation with Optional Stop at 45/60/80 Swivel Cleat
    Allen
    Price: £42.40 RRP: £47.11 | Save £4.71
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  • Stand Up Base Adapter
    Ronstan
    Price: £42.59 RRP: £47.32 | Save £4.73
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  • Composite Swivel Cleat, Small
    £43.07
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  • Swivel Cleat
    Allen
    Price: £44.75 RRP: £49.72 | Save £4.97
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  • Swivel Cleat With Removable Sheave
    Allen
    Price: £46.44 RRP: £51.60 | Save £5.16
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  • Small Swivel Lead with Composite Cleat Swivel Cleat
    Allen
    Price: £48.08 RRP: £53.42 | Save £5.34
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  • 25 mm Low-Load Base swivel
    Harken
    Price: £49.92 RRP: £55.47 | Save £5.55
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  • Mast Swivel 27
    Selden
    £50.22
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  • Large Swivel Lead with Composite Cleat Swivel Cleat
    Allen
    Price: £51.10 RRP: £56.78 | Save £5.68
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  • Spinlock PXR Deck Swivel Cleat (2-6mm)
    £52.63
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  • Bullseye With Swivel Base & 27mm Cleat
    Ronstan
    Price: £57.12 RRP: £63.47 | Save £6.35
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  • Mast Swivel 38
    Selden
    £57.61
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  • Spinlock Vertical Pivot PXR Camcleat (2-6mm)
    £57.97
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  • Bullseye Swivel with Midi Cleat
    £61.26
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  • Cleat Base
    Ronstan
    Price: £62.70 RRP: £69.67 | Save £6.97
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