Items for Sale/Wanted

My compression post has more than a bit of corrosion on the bottom plate, and lower tube. Wondering if anyone has a decent one taking up space?

Mariner 3473 in Vermont

I think I have one. It is aluminum tubing with a rectangular plate at top and bottom. Do you have a picture of one?

Hello, yes that is what they look like. How is the corrosion on the plates in particular?

Mariner 3473 in Vermont

I don't remember, but I think not much. I will post a pic.

Pics of my compression pole attached. I wire brushed the bottom plate and it does have some pitting in one corner.

John, Thanks for those. Unfortunately, that one isn't very much better than mine.

That said, what might you ask for it?

Mariner 3473 in Vermont

It would be of interest to know what labor and material rates are for welding up a compression post.

Aluminum tube and two plates.

$100-150 an hour plus parts is a deal breaker.

What does a new post cost? The assembly, final result and alignment, depends on the weld fixture and skill. Metal moves around while welding. Some auto body shops can weld aluminum.

A piece of tube and two plates.. sounds simple, bet it ain't.

SV Bren Marie 4040

I'd check with Rudy and D&R marine or Stuart at Stuart Marine to see how much a new one might be.

I currently have my post out and the bottom is a little bit corroded as well. Does it matter? I am also curious what others have found underneath the post? On mine it was two pieces of plywood, 1/2" and 1/4" with the lower one attached by two screws into the hull and then the second one screwed down on top of that. There was some putty underneath the lower piece but clearly not enough to support it properly so over time the (damp) plywood deformed a little but not much.The plastic underneath the plywood was only slightly cracked and of course I got the typical ooze of water out of the holes but with bow tipped down that seep stopped after a while so hopefully my foam is not heavily saturated.

My goal is to replace that block with a piece of pressure treated wood that runs fore/aft in that space, beveled to match the curve of the inner hull so it sits flat down against the plastic as I would like to put my battery in that space. The bottom of that space is an interesting shape: the "v" is not centered and that space is sloped slightly down fore-to-aft.

What have others done to rebuild underneath the support post?

Eric

#2989 Vagary

Lake Champlain, Vermont

I can't remember for certain what was under mine, but probably wood shims. Whatever it was needed replacing. So I replaced it last summer before launching with glass-filled body filler.

I built a small form out of plywood that matched the v-shape, then filled it with filler to the appropriate height. Once set, I removed the form and sanded/filed down any sharp burrs or edges. Then I put the post back in place, drilled pilot holes into the casting, and screwed the base into place with stainless screws. I believe the screws were long enough to go through the casting and into the fiberglass below.

I don't seem to have a picture of the end result, but I took one of the form in place before filling. I believe I roughed up the bottom surface to promote adhesion of the filler.

After cleaning out below the post, I mostly filled the space by pouring in high density foam. (16lb I think.) Very similar to the red"putty" on our boats. I did not use a form, because I undercut the FG deck, and wanted the foam to expand to fill in under the deck. Then fiberglassed over the top, and to join the patch to the inner hull.

I ordered some flat aluminum stock to replace the foot of the mast support, and some solid round bar stock from McMasters Carr. The round bar stock is sized to fit inside the hollow round tube of the original support. I cut the end of the round bar stock to the appropriate angle, drilled and tapped the angled end, and bolted on the flat stock with a flat top bolt. I screwed the renewed post top and bottom into the boat. With everything in place, I through bolted the outer sleeve and inner stock together in several places. Probably all stronger than the original.

Sorry. I wasn't taking pictures back then.

Mariner #3459, Centerboard 2+2

Date of manufacture: 03/1977

Eric, there are lots of threads about rebuilding this area, but it sounds like you are doing so without cutting out the floor of the inner hull to expose the foam and actual hull below. Just be aware that many descriptions of this repair involve cutting away the crack inner hull, and some don't.

The inner hull of mine was cut away by a PO.

Also, the PT 2x lumber that was under my post was wet again, and had clearly squished over time since it was water logged I'm guessing.

Pine my not be a lasting repair, even if PT.

Mariner 3473 in Vermont