Masthead sheave box wanted

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Michael4
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Location: West Sussex

Masthead sheave box wanted

Post by Michael4 » Thu Sep 18, 2014 9:07 am

I'm looking for a masthead sheave & sheave box for an early ally Proctor mast on a '59 Merlin with the halyard running in the luff groove.

The original is Tufnol but material is not so important.

It is a single sheave.

The box is 15mm wide, 47mm tall and has a depth (front to back) of 29 mm

It is held in the widened luff groove by two (3/4mm) ally pins (which I also need) their centres are 38mm apart.

Difficult to tell what the original sheave measured, not a lot left but it is around 8mm wide with a diameter of approx 22mm

Can anyone help or point me in the right direction...and how do you spell sheave?

Thanks

Michael
Tideway 206
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Sold the 'Something bigger and plastic', it never got used.

Stephen Hawkins
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Re: Masthead sheave box wanted

Post by Stephen Hawkins » Fri Sep 19, 2014 11:30 am

Micheal,

Sorry to hear about the sheave breaking up.

It would all have been imperial measurements so it might be best to quote the measurements as such, if looking for a period replacement. Or are you happy with something that just works?

Can you just replace the sheave itself?

http://www.proboat.co.uk/item.asp?cat_i ... =597&dep=1

Steve H
Steve Hawkins

1967 National 12 2383 "Sparkle"

Michael4
Posts: 500
Joined: Fri Jan 03, 2014 5:25 pm
Location: West Sussex

Re: Masthead sheave box wanted

Post by Michael4 » Fri Sep 19, 2014 11:43 am

Well after 55 years the sheave itself looked more like a squashed bagel (one lip missing completely) and I guess the halyard had been jamming against the side of the box it sits in as the pressure came on. It did not run well at all. Tufnol. I should have checked it before I put the mast up but was concentrating on the other end!

The box sits in the widened luff groove and is pinned in place by a couple of ali pins.

Rolled the boat and took it out yesterday. Spent a happy hour in the garage with epoxy, a small s/s block, bits of a clevis pin and a glass of wine.

Have just re-coated with epoxy to further strengthen the box and am quite pleased with my creation (although it doesn't look too 'great').

Will put it back together in a day or so and we'll see. If it works I obviously won't be needing a replacement.

Michael
Tideway 206
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Sold the 'Something bigger and plastic', it never got used.

Rupert
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Re: Masthead sheave box wanted

Post by Rupert » Fri Sep 19, 2014 12:19 pm

Did you stick your hand to the wine glass?
Rupert

Michael4
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Joined: Fri Jan 03, 2014 5:25 pm
Location: West Sussex

Re: Masthead sheave box wanted

Post by Michael4 » Fri Sep 19, 2014 12:30 pm

Tesco Australian Red wine box (oh yes, you know the one).

I use it for dissolving excess epoxy!
Tideway 206
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Sold the 'Something bigger and plastic', it never got used.

chris
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Re: Masthead sheave box wanted

Post by chris » Fri Sep 19, 2014 5:49 pm

is this what you need?
It off a decent but redundant merlin mast but if no one wants a mast then the sheave is yours.
I might check with Roger too as he has a really (s)crappy mast I gave him which didn't work and I think it has the same fitting.
sheave.jpg
(51.58 KiB) Not downloaded yet
Note that this one is fixed with self tapper so that makes it easier. I think the measurements match.

Michael4
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Joined: Fri Jan 03, 2014 5:25 pm
Location: West Sussex

Re: Masthead sheave box wanted

Post by Michael4 » Fri Sep 19, 2014 10:11 pm

Chris,

Many thanks. This indeed does look like what I want (if the size is right) but let's just see if my epoxy masterpiece works before you strip that one off what sounds like a perfectly good mast that someone might need in the future.

Yours, being an alloy box, looks much newer but then that mast is anodised too, which 950's isn't.

(for that one I claim an award for one of the worst sentences in English...ever!)

Thanks again, will let you know how I get on.

Michael
Tideway 206
11+
Sold the 'Something bigger and plastic', it never got used.

Rupert
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Re: Masthead sheave box wanted

Post by Rupert » Fri Sep 19, 2014 10:34 pm

Michael4 wrote:Chris,



Yours, being an alloy box, looks much newer but then that mast is anodised too, which 950's isn't.

(for that one I claim an award for one of the worst sentences in English...ever!)



Michael
You don't frequent the Y&Y forum, then...
Rupert

JimC
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Re: Masthead sheave box wanted

Post by JimC » Sat Sep 20, 2014 3:34 pm

Rupert wrote:You don't frequent the Y&Y forum, then...
The quality of the english is not IMHO the primary problem there right now...

Michael Brigg
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Location: Gosport, UK

Re: Masthead sheave box wanted

Post by Michael Brigg » Sun Sep 21, 2014 12:49 pm

Michael4 wrote:Chris,

...Yours, being an alloy box, looks much newer but then that mast is anodised too, which 950's isn't.

(for that one I claim an award for one of the worst sentences in English...ever!)

Thanks again, will let you know how I get on.

Michael
I would blame the Aussie wine personally :twisted: . (Since it's our WFU world cup next year!! :lol: )

Image ...or if you want a red Image
Michael Brigg

Michael4
Posts: 500
Joined: Fri Jan 03, 2014 5:25 pm
Location: West Sussex

Re: Masthead sheave box wanted

Post by Michael4 » Tue Sep 23, 2014 2:43 pm

All sorted. The epoxy/Tufnol/stainless steel creation is in place and appears to function well. I have used 'monel' split pins to secure it since I couldn't find any aluminium pins. I am assuming that 'monel' is closer to aluminium than stainless...

Chris,

Thanks for your help. If this fails I will be in touch!

Michael
Tideway 206
11+
Sold the 'Something bigger and plastic', it never got used.

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