Pulley for raising gunter rig

[pcatterall]

Thanks for the help in telling me what was missing from my dinghy rig, I now know where everything fits!!
I realise that the original wooden extension for the lower mast had rotted away, I have made a new one but now need a roller to fit into the top of this wooden extension to take the gaf raising halyard; In fact I recall that the original had a double block inset into the extension although I cant think what the second roller did?
I cant see this type of roller in dinghy or chandlers guides nor have I seen similar in DIY shops.
I just intend to cut a slot in the top of the wooden extension so that the rollers will fit in that being bolted in from the sides.
Is this a bit of 'normal' dinghy gear and can anyone kindly point me in the right direction.
many thanks.

 

[panthablue]

Got any pictures?

 

[Chrusty1]

What you need is a pair of sheaves, one is for the throat halyard, the other is for the gaff peak halyard. If you have a squint in a Barton catalogue, you find them in there.

If that is not clear for you, let me know, and I will post a link or two to some diagrams.

 

[VicS]

I have looked at the pictures you posted earlier and the responses to your question and thought perhaps the way in which a Mirror dinghy is rigged would be of interest (Very similar to LS's Heron)

The wooden plug in the top of the mast carries a single sheave for the main Halyard. The block on a short wire strop is for the jib halyard. (The Mirror has a stayed mast, the shrouds and forestay having soft eyes that fit the top of the mast in the same way as the jib halyard strop)

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The main halyard attaches to the gaff by menas of a "gaff band". The Gaff is actually slotted to form a track for the sail luff rather than having the sleeved sail like yours.

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The gaff has jaws similar to yours. The parrel line was originally a piece of light shock cord.

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This boom has a fully articulated goose neck fitting. This boom is fitted with a tack downhaul (shown) and also a clew outhaul with a 2:1 purchase.

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[pcatterall]

Many thanks guys especiaaly the very useful photos from VicS I should be able to sort it all out now.
The dinghy is the tender from my ( now sold yacht) so all I need is a new boat to go with this great little tender!!

 

[Lakesailor]

Like Vic's pics of the Mirror rig the Heron had the jib halyard block on a short strop hung over the post at the top of the mast. If you have a headsail and no post on the mast top, perhaps the second sheave is for the headsail halyard?
If it's a gunter rig it won't have a peak halyard.
Just put two sheaves on a common bolt, with some washers between so they don't interfere with each other.

You can see the post on the mast and the short wire strop and block for the halyard in this pic

 

[pcatterall]

Thank you Lake Sailor !! still looking for the actual sheaves though!! it looks like I will have to pull one to bits and shove a new shaft ( bolt) through the bearing with spacer washers as you suggest.

 

[VicS]

Chandlers esp those selling fittings for dighies should have the plastic wheels like you see in the Mirror mast.

Holt Allen part number HA/150 (and that may include the axle)

In the mirror it just fits on a piece of aluminim tube that is a good tight fit in the wood.
Not sure Id want to put two in a mast that diameter though. Why do you need two?