Ronstan Series 15 Ball Bearing Utility Block - Stand-Up Block - RF15141

Ronstan Series 15 Ball Bearing Utility Block - Stand-Up Block - RF15141

Marsoni

M251S

$18.99

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

Ronstan Series 15 Ball Bearing Utility Block - Stand-Up Block - RF15141Series 15 Ball Bearing Utility Block Stand Up Block Features: Smallest and lightest ball bearing block available Precision molded acetal sheave running on stainless steel ball bearings provide high performance & low friction Single loop head blocks include an O ring to separate running line from head lashing or fixing Applications: Dinghy control lines Vangs, cunninghams and tweakers Shock cord tensioning systems Materials: BB sheaves: UV stabilized

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Definitely better than the old plugs that probably had 80k miles on them. The one star off is because I had a misfire after installing. Not sure if I damaged the plug or what, but a reinstall didn't fix the misfire. In my genius, I rushed to try to gap it and ended up breaking the iridium tip. Put the old plug into cylinder 3 (where the misfire was) and it was fine. Gonna have to get a new single tomorrow at my local shop, but a bit frustrating to get a misfire after install.

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Reviewed in the United States on April 27, 2026

Verified Purchase

Britincali

Belleville, US

★★★★★ 5

Upgrade from OEM

After seeing a quite ludicrous $403 quote to change 4 spark plugs in a Mazda3 I decided to show my son how easy it is. These were an upgrade from OEM parts. They were gapped perfectly for the car. They took 20mins to fit and work fine.

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Reviewed in the United States on February 11, 2026

Verified Purchase

ANDRES FIGUEROA

Lexington, US

★★★★★ 5

Very good

The best quality. Runs like new again.

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Reviewed in the United States on March 12, 2026