Main Sheet Block O'day DS 1972

Joe

.
Jun 1, 2004
8,233
Catalina 27 Mission Bay, San Diego
I need one my project boat is missing it, and Starboard traveler block.
Go to ANY online sailing website and search through their hardware inventory. When you find a picture of something you think might work, make a note of the block's description or its name. Once you have that you can fine tune your search with google and often discover a number of sources for you to compare items and make make your choice.

Boat parts are rarely described using a boat's make or model. The part is more commonly identified by physical appearance or construction.... an example: "single, swiveling ratchet block with a becket and cam cleat ... this particular description, btw, could easily describe a lower mainsheet block for a smally boat. Some hardware pieces are described by their uniqueness.... for instance, a "cheek" block, or a "snatch: block... these parts would be further identified with physical features..... i.e. 35mm single cheek block, 40mm snap shackle base snatch block. Okay........ it gets better because most online dealers will have the gear grouped by manufacturer FIRST, ...with each manufacturer having a number of pages dedicated to their own versions of these parts........... WHEW!!!!!! That's why you want to kind of know the name of the block first.......... google it .... and go from there.
 

DelVel

.
Sep 7, 2025
4
O'Day DS 1972 Twin Lakes,Idaho
Thanks,Joe. I'll try your suggestions. It's been difficult to get the correct mounting. I'll take a picture and send it to you. Perhaps you can help me write a correct description, you seem very familiar with sailboat jargon. This particular one has four(4) mounting screws. My base bracket only has two(2).
Perhaps I'll have to change the base mount. Do you know if the base mount is through bolted, or just screws?

Thanks,
Del
SAM_0559142013ODay17.JPG
 
Sep 24, 2018
3,587
Catalina 30 MKIII Chicago
There are many ways to handle this. In the end you want something to attach a modern mainsheet block to. You can modify your existing hardware or you can install a pad eye. I would try to find a four screw pad eye but I wouldn't exect the screw holes to line up. You'll likely have to fill in the old ones and drill new ones
 

jssailem

SBO Weather and Forecasting Forum Jim & John
Oct 22, 2014
23,496
CAL 35 Cruiser #21 moored EVERETT WA
So holes are not through bolted?
Not necessarily.

Screws may be installed into fiberglass or into tapped metal threaded holes beneath fiberglass, as well as through the deck, where a backing plate, washers, and nuts are installed.

Screws into fiberglass would be the weakest design, not likely to be used for a mainsheet block.
 

DelVel

.
Sep 7, 2025
4
O'Day DS 1972 Twin Lakes,Idaho
Thanks . Guess I'll have to try to unscrew to see if there's a backing plate. Area is unaccessable so it's either screws or bolts w/plate.
 
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jssailem

SBO Weather and Forecasting Forum Jim & John
Oct 22, 2014
23,496
CAL 35 Cruiser #21 moored EVERETT WA
Welcome to the forum. When you acquire an older boat, most of the fun is discovering what you got, how to fix broken things, and how to improve it.

Then, of course, there is the sailing.
Good Luck.
 

Joe

.
Jun 1, 2004
8,233
Catalina 27 Mission Bay, San Diego
Not trying be a pill here, but that picture is TOO close. back up a bit so we can see the entire assembly, then... you may add a close up to a particular area that concerns you.

You should understand that the comments you're getting here are not necessarily from your specific boat's owner group. Most of us choose "ask all sailors" when setting up our filters because most sailboat questions don't really need model specific answers. They're just general questions that could apply to any number of similarly sized boats. Questions about marine diesels, for instance, or fiberglass repair, rigging, electrical systems etc. They are often general subjects where you benefit from a large database rather than just the few members who own boat like your own. It's a huge advantage and is mainly the reason this forum has been so active over the years. Good luck.