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 Catalina 25 Specific Forum
 Attaching hardware to the mast or boom		  New Topic  Topic Locked
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pfduffy
Captain

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USA
317 Posts
Initially Posted - 07/13/2009 :  14:20:31  Show Profile
I will soon be taking a drill to the mast and boom for the first time to install some blocks and fairleads for a new reefing system. Can I use self tapping SS screws or should I drill and tap each mounting point?
Pat Duffy
1984 SK/SR #4113
Slàinte
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Prospector
Master Marine Consultant

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Canada
3159 Posts
Response Posted - 07/13/2009 :  14:24:07  Show Profile  Visit Prospector's Homepage
I moved our turning blocks aft on the &lt;edit&gt;<s>mast</s> <b>boom</b> &lt;/edit&gt; and re-used the self tapping screws that the PO had installed the first system with. Worked fine.

A tip... put the turning blocks 6" or so further aft than you think you need. There is lots of real-estate there and you may as well use it. Pulling the sail back when you reef will give it better shape.
Edited by - Prospector on 07/13/2009 16:03:09
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dmpilc
Master Marine Consultant

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USA
4593 Posts
Response Posted - 07/13/2009 :  15:19:31  Show Profile
If you use self-tapping screws, be sure to have a few extras on hand. I've ruined the head on SS screws before doing that. The mast is another matter. It will likely be a thicker extrusion. Just go slow.
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Dave Bristle
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Djibouti
10005 Posts
Response Posted - 07/13/2009 :  17:16:19  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by dmpilc</i>
<br />If you use self-tapping screws, be sure to have a few extras on hand...<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">...and a mini Vice-grip to remove the screw after the head twists off.
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mlg3733
Navigator

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118 Posts
Response Posted - 07/13/2009 :  19:15:22  Show Profile
You need to tap any hole you drill, it takes a minute and will allow to screw anything in and out. Self tapping screws don't work in anything that thick.
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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Response Posted - 07/13/2009 :  19:31:21  Show Profile
Also, select SS bolts that are just long enough for the item you are attaching and the boom/mast thickness. That way you wont have a bolt (worse yet screw) getting in the way of, or catching on, internal lines inside the boom or mast.
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pfduffy
Captain

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USA
317 Posts
Response Posted - 07/13/2009 :  19:57:04  Show Profile
So drill and tap it is! Gives me an excuse to buy another tool.
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dmpilc
Master Marine Consultant

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USA
4593 Posts
Response Posted - 07/13/2009 :  20:07:28  Show Profile
Pop rivets are another way to go. I did that with the mast pad eye for the whisker pole. Just be sure to use the same size pop rivet as the drill bit.
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pastmember
Master Marine Consultant

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2402 Posts
Response Posted - 07/14/2009 :  12:23:41  Show Profile
All of the above, depends on the hardware. SS base plates are thin so pop rivet work well. Cast aluminum base plates are thick and I prefer to drill and tap but have used self tapping screws often. On the end of boom reefing cheek block, don't put it too far back. It should only be about two or three inches back from the reefed clew, otherwise the angle is wrong and the reef line does not pull down enough.
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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.