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Old 11-02-2010, 09:30   #1
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Join Date: Feb 2008
Location: Vancouver Canada
Boat: Cooper Maple Leaf 42
Posts: 130
Aluminum or Plastic Halyard Sheave

Hi Everyone
I am looking for advice regarding the main halyard Sheave. I have removed my mast and changing the standing rigging I have noticed I will have to change the main Halyard Sheave The original has side play, and it was originally used with SS wire and spliced to rope. I have switched to all rope and was expecting to easily find a replacement Aluminum 4” OD sheave. My rigger is saying he can find plastic sheave at a pretty penny. My question is it advisable to switch to plastic or should I continue searching for Aluminum Sheave Does anyone know where I can find an aluminum sheave to fit ½’ to 9/16” main halyard rope. I was looking for Halyard shelve 4”OD. 5/8” wide ½” inside dia. of bushing to fit ½ t0 9/16” rope Any advice as always will be appreciated.

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Old 11-02-2010, 09:38   #2
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Location: On the boat - Carib, Chesapeake
Boat: 58 Taswell AS
Posts: 1,139
Stay with the metal sheave. The friction and tension of the halyard will eat through a plastic sheave. Try any rigger for the part.

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Old 11-02-2010, 10:11   #3
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Location: Tampa Bay area, USA
Boat: Beneteau First 42
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Check with Garhauer for replacement metal sheaves. They can be had with roller bearings at very reasonable cost. A friend of ours with the same boat we have (42') replaced his for under $100 USD each.

"It is not so much for its beauty that the Sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."
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Old 10-04-2010, 17:21   #4
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Location: Oriental, NC
Boat: Cal 39
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Sergy-- Just bought a similar one. Same dimensions as my original alloy one, but w/ a better groove configuration. Looks like your size is a standard item @
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Old 10-04-2010, 18:40   #5
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Boat: Dragonfly 1000 trimaran
Posts: 6,098
My all rope system has Delrin plastic sheaves. Boat's a '95 with no bearings, just a 1" or so shaft and no wear I can see.
Memento,homo, quia pulvis es, et in pulverem reverteris.
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Old 14-04-2010, 03:00   #6
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Location: Western MA & Maine
Boat: 1997 Sabre 362
Posts: 59
Look at Zephyrwerks or Rig-Rite

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