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 Block at base of mast

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Oneday Posted - 06/10/2022 : 01:48:54
I have a 1986 swing keel. It has a block on each side of the base of the mast, one for the main and one for the jib halyard. I would like to change those. They are available from cd but I canít get the screws loose. They seem totally frozen. Any suggestions? Thanks Dan
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Voyager Posted - 06/14/2022 : 08:33:42
The corrosion created by aluminum contacting stainless steel comes from a galvanic process. I believe that dielectric grease is the answer in this case. Some products are Corrosion Block or Silicone Paste.
Derek Crawford Posted - 06/14/2022 : 06:24:25
Bruce, I am having a senior moment, I can't remember. It's at least 15 years since I last used it...It's whatever stopped the galling.
Voyager Posted - 06/13/2022 : 21:47:20
Loctite? or Never seize?
Derek Crawford Posted - 06/12/2022 : 13:58:38
And when you replace them don't forget to use Loctite.
Stinkpotter Posted - 06/11/2022 : 20:36:31
PB Blaster... penetrating oil plus I don't know what, but given some time (like a day or two), it can do wonders. Then whack the head of the screw with a hammer (semi-gently).
Leon Sisson Posted - 06/11/2022 : 12:22:08
I agree with Scott about the usefulness of an impact driver.  However, I suggest first applying penetrating oil and heat.  A soldering iron might be a good way to heat just the screw with minimum risk of starting a fire.  A few heat/cool cycles should help loosen some of the corrosion before wailing on it with the impact driver.
islander Posted - 06/10/2022 : 04:28:22
As you have found out, Stainless screws that are screwed into aluminum can corrode and lock together. What every boater that works on boats should have in their tool box is an Impact screwdriver. This tool works by hitting the end of the tool with a hammer and it then transfers a sharp twisting motion to the screw to remove it without destroying the screw head.

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