Ronstan Series 40 Ball Bearing Block - Triple - Swivel Head - RF40300

Ronstan Series 40 Ball Bearing Block - Triple - Swivel Head - RF40300

Marsoni

M251S

$67.99

Get it in 3 business days with 1 day shipping. Friday, May 29

Ronstan Series 40 Ball Bearing Block - Triple - Swivel Head - RF40300Series 40 Ball Bearing Block Triple Swivel Head Features: Low friction Acetal or Torlon bearing system Lightweight Cheek cut outs for easy bearing maintenance Features a swivel shackle head for full 360 rotation Sheaves running on Acetal or Torlon ball bearings provide high performance & low friction. The 2 stage ball bearing system provides consistent performance over the full load range. Applications: Mainsheet Halyard Vang Spinnaker control lines

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Pack a lunch when you tackle this project boys.. its a doozy!! Month in going great so far definetly did what I purchased it to do. 2000 chevy with two p3 10s every bass drop sounded like an old firebird with loose trunk bolts. Threw this on the back walls floor underneath the speaker and the doors.. all that energy is now in the cab with me instead of getting lost in rattling metal!! Love it!!! Left a few pieces outside after I was done rained like hell on them so water doesnt hurt this stuff at all or direct sunlight in south mississippi.. good stuff pick this up and make them systems thud instead of rattle!!! You wont regret it!! I didn't!!

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Reviewed in the United States on June 11, 2026

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Roseanna Boyce

Charlottesville, US

★★★★★ 5

Delivers a quieter ride

Size: 36 sqft

This works very well to put down road noise. The difference was immediate in my van. I was shocked it made such a difference.

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Reviewed in the United States on June 6, 2026

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Louisville, US

★★★★★ 4

Reasonably priced sound deadening

Size: 18 sqft

Easy to cut with a carpet knife. I used a heatgun to make it stickier and more moldable. The foil isn't so thick that you risk cutting yourself like some Dynamat variants.

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Reviewed in the United States on March 12, 2026

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David

Lexington, US

★★★★★ 5

Works for me

Size: 36 sqft

Sticky so don’t let it touch you or each other but it comes off and works fine.

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Reviewed in the United States on June 7, 2026

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