[Public-List] Masthead sheaves.

[George Dinwiddie]

Stephen,

On 11/26/12 1:18 PM, Stephen Gwyn wrote:
>
> Hi,
>
> I climbed out the mast on Saturday and pulled out all
> the masthead sheaves, which were in a woeful state.
> Not to mention the thin plate of aluminum which goes
> between the sheaves, which had several sharp snags
> on it.
>
> The aluminum plate is easy to replace, but the sheaves
> don't seem to be a very standard size. They're also
> fairly worn, so I'm having difficulty getting
> accurate measurements. Can anyone confirm the following:
>
> Outside diameter 2 1/2"
> Hole: 3/8"
> Width: 7/16"
> Groove depth: 7/32"
>
> I'm running 10mm line (a smidge over 3/8"). Are there
> better dimensions?
>
> I see older posts about a group purchase of sheaves.
> What were the dimensions of those sheaves?

Take a look at 
http://alberg30.org/maintenance/SparsSailsRigging/MainSheave/ and 
http://alberg30.org/maintenance/disorganized/sheave/ Neither of these 
corresponds to that group purchase, but should be similar.

2-1/2" sounds very small to me. Did your masthead have more than one sheave?

  - George

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