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 Catalina 25 Specific Forum
 Spreader Bracket retrofit		  New Topic  Topic Locked
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GeorgeB
1st Mate

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90 Posts
Initially Posted - 02/18/2004 :  17:33:17  Show Profile
Hi
I've got a question today. I've installed the stainless steel spreader bracket from CD on my tall rig mast. Now I'm installing the old spreaders. It appears that when the holes for the cotter pins are lined up that the spreaders will not be fully seated in the brackets. My thoughts on this issue are 1) The spreader tips have to be the same distance from the mast as there were with the old brackets, or the old shroud will not fit. 2)It would be better if the spreaders were fully seated in the brackets to transfer loads to the mast, rather than load the cotter pins with a shear load. I'm thinking of shimming the spreaders out to the correct length with SS washers and then redrilling the holes for the pins. Any thing I'm missing?
George Barton
Abegweit
1980 SK/TR #1872
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 02/18/2004 :  18:42:42  Show Profile  Visit Frank Hopper's Homepage
Have you double checked to see if the spreaders fit all of the way in the old aluminum brackets? Make sure you really have an new issue.
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 02/18/2004 :  19:49:22  Show Profile
As I recall, I had the same issue. About 30 seconds with a cordless drill on each side remedied the problem. (just drill through the spreader using the holes in the spreader socket as a guide)
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JimB517
Past Commodore

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USA
3285 Posts
Response Posted - 02/18/2004 :  21:26:05  Show Profile  Visit JimB517's Homepage
there is very little load transmitted to the mast through the spreaders. The purpose of spreaders is to increase the angle made by the shrouds with the top of the mast. Allmost all the load is carried to the chainplates.
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Leon Sisson
Master Marine Consultant

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USA
1893 Posts
Response Posted - 02/19/2004 :  00:42:14  Show Profile  Visit Leon Sisson's Homepage
George,

I would caution that when the boat is heeled well over, there might be significant compression load on the windward spreader. That's one reason why Catalina provided all those internal mast compression sleeves with the new spreader bases. (I installed four as I recall.)

I would do as Admiral ClamBeach suggested, and fully seat the spreader tubes in the spreader base sockets, then drill new cotter pin holes if needed. Don't forget to pin or wire the spreader tips to the tubes, and wire the upper shrouds to the tubes as well before installing the boots. The shim washer idea is clever, but I don't think it will be required. Any resulting change in rig tuning should be well within the adjustment range of your turnbuckles. You are using open body turnbuckles, right?

When I upgraded the spreader bases on my 1979 C-25, at the same time I also switched from a tall rig to std, rebuild the whole new-to-me used mast, replaced the spreader tips, five chainplates, all eight turnbuckles (with bronze open body jaw-jaw style), removed and reinstalled the upper chainplates using different bolts, added a mast base plate, made up all new custom standing rigging, etc. So I can't really say what if any effect the upgraded spreader bases had on my rig tuning. I do recall that it all fit back together just fine.

-- Leon Sisson
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GeorgeB
1st Mate

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90 Posts
Response Posted - 02/25/2004 :  18:11:17  Show Profile
Guys, Thanks for the input.
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Champipple
Master Marine Consultant

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USA
6855 Posts
Response Posted - 02/26/2004 :  08:09:05  Show Profile  Visit Champipple's Homepage
As I recall, I had to drill as well.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.