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Jeff McK
Captain

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USA
389 Posts
Initially Posted - 03/23/2005 :  20:22:10  Show Profile
Does anyone know the dimensions & composition of the round-head rivets that are used to hold things like the forestay to the masthead casting? I need to attach a block for a spinnaker halyard.

Thanks
Jeff McK
Formerly Event Horizon (sold)
C250 WK #805
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johnsonp
Admiral

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USA
606 Posts
Response Posted - 03/23/2005 :  20:33:28  Show Profile
Do you mean the pop rivets?
paulj #719
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Jeff McK
Captain

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USA
389 Posts
Response Posted - 03/23/2005 :  21:24:18  Show Profile
Paul,

These are definitely NOT pop rivets,

They look like relatively thick pins (probably stainless steel) used to hold the sheaves & stays in place. The owners manual describes them as round-head rivets. I would guess they are 1-2 inches long & ~1/4" thick, but the drawing & spec sheets do not describe the dimensions.

It also looks like there are small holes drilled through one end for a cotter pin.
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 03/24/2005 :  08:55:12  Show Profile
They are probably stainless steel clevis pins.
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Jeff McK
Captain

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USA
389 Posts
Response Posted - 03/24/2005 :  11:28:07  Show Profile
Don,

That is probably the correct term. Thanks for clarifying this. I've also got a call out to Catalina for the info as well. If they come through I'll pass it on.

The replacement masthead castings thatCatalina.com sells apparently have all of them pre-installed. I'll double check my rig to be sure they are all there from the factory.
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frog0911
Master Marine Consultant

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USA
1349 Posts
Response Posted - 03/24/2005 :  21:45:56  Show Profile
Jeff, it is a 1/4" clevis pin. The length is 1 3/4", but the nearest I could find was two inch so that is what I used for my drifter block.
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Keith D.
Navigator

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USA
233 Posts
Response Posted - 03/24/2005 :  23:38:46  Show Profile
Here is a post on this subject from before. It has some more information in it. http://www.catalina25-250.org/forum/topic.asp?TOPIC_ID=6367
Edited by - Keith D. on 03/24/2005 23:45:21
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Jeff McK
Captain

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USA
389 Posts
Response Posted - 03/25/2005 :  13:02:13  Show Profile
Frog & Keith,

That's exactly the info I was seeking.

One concern: The link says 5/16, Frog says 1/4. That's a small but significant difference. I can always go with a 1/4", but just thought I'd mention that discrepancy.

FROG: did you run a separate halyard through the drifter block from the deck, or is it OK to run the (unused) jib halyard from the sheave through the block & turn it into a drifter/spinnaker halyard? It look like it would run OK from the drawing, but I'm concerned about chafing the line on the masthead casting.

Thanks!
Edited by - Jeff McK on 03/25/2005 13:18:28
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frog0911
Master Marine Consultant

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USA
1349 Posts
Response Posted - 03/25/2005 :  18:23:12  Show Profile
Jeff, I thought it was 1/4, but now that you mention it 5/16 sounds correct. I think all of the pins on the masthead are the same diameter, just different lengths. Since my jib halyard is used to pull up the roller sail,(snapfurl system) I ran a separate halyard for the drifter. It is all external from the bow, masthead block, deck block, orgainizer and to a triple clutch at the cockpit.
I think there are members that have used there unused jib halyard for this. I don't know anything about a CDI furler except that you don't use your jib halyard to haul the sail up. I think it would depend on were the furler hooks to the mast. I would'nt think you'd have any problems using it for that purpose.
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frogger
Navigator

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USA
184 Posts
Response Posted - 03/26/2005 :  00:00:38  Show Profile
Just purchased an asymmetrical spinnaker from Doyle and I plan to use the jib halyard since it is not used by the CDI furler. I'm planning on running the tack line back to the cockpit and the sheets to the aft turning blocks to a selftailing coaming winch. If I run into any problems I'll let you know.
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Jeff McK
Captain

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USA
389 Posts
Response Posted - 03/26/2005 :  08:42:51  Show Profile
Lots of frogs out today

Frogger: I've got a similar setup currently, except I run the sheets to cam cleats on the cockpit coamings.

Well, I'm off to experimment. Will keep you posted.

Thanks
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bill bosworth
Navigator

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USA
172 Posts
Response Posted - 03/27/2005 :  16:56:45  Show Profile
Jeff;
I was working on my mast today, find that all of my pins are 5/16 x 2"
Bill
c250wb #134 Serendipity
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Jeff McK
Captain

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USA
389 Posts
Response Posted - 03/28/2005 :  08:07:37  Show Profile
Bill,

Thanks for the update. On a good note, all the pins are in place as shown on the drawing Keith added. However...

I took another look over the weekend. The riggers put the forestay on the most forward pin. I didn't catch this when I took delivery last fall.

At this point I don't know that it's worth messing with moving it aft for a new asym halyard block. It would involve detensioning the fore & aft stays, rigging a temporary forestay, going up the mast, moving the stay, retuning the rig, etc.

When I went up to look at it I am not 100% sure there is enough clearance to reroute the halyard over the top of the end casting of the forestay to the block without chafing the line as it runs over the pins.

The other concern is possibly having to mess with the forestay length. Guess I'll call the rigger & see if they can put it on the correct pin without a huge amount of work. Otherwise I'll let it go for now.

It's always something...
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