Building a KARA Hummer Layout Duck Boat #8: Anchor Pole Through-Hull Hole and Collar

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Blog entry by DustyMark posted 05-25-2015 03:50 AM 1972 reads 1 time favorited 0 comments Add to Favorites Watch
« Part 7: Sealing the Hull Interior Part 8 of Building a KARA Hummer Layout Duck Boat series Part 9: Applying the Plywood Deck Panels »


We mostly hunt shallow water and the anchor pole sleeve will simplify maintaining position in the decoys with an anchor pole. I opted to install one in the bow and the stern. These go through the hull and I was concerned about water leaking through the sleeve into the hull. Instead of making the sleeve flush with the exterior bottom of the hull, I decided to make the sleeve fit flush on the inside bottom of the hull, surround it with a collar, and seal it in a bed of marine caulk.

View of the sleeve and collar before gluing the collar to the floor.

Making the Sleeve Collar

I used 1/4” marine plywood scraps to make the sleeves.

I produced the collars in a batch.

Drilling Through the Hull

I figured a way to make a very clean through-hull hole by using a flush trimming bit in the router. I began by clamping the sleeve in place and tracing around the outside.

A right angle attachment made the hole easy to drill the reference hole.

View of hole through the hull.

With the sleeve clamped in place, the inside of the sleeve (PVC pipe) provides the perfect template for the flush trimming bit. The through-hull hole is perfectly aligned and very clean.

Gluing the Sleeve Collar

We flipped the boat upright to glue the sleeve collar.

I taped some spacer material to center the sleeve in the collar. Notice the wax paper to avoid gluing the sleeve in the collar.

The hull is curved in this area and the collar had some spring to it when pushed against the floor. I took advantage of this and cut scraps of wood to wedge between the collar and the sleeve clamp. This worked great to clamp the sleeve in place while the epoxy cured.

The collar aligned well. Unfortunately, I glued the collar before going to bed and decided I would scrape any excess glue in the morning….MISTAKE! The epoxy got underneath the sleeve and was green cured by morning. I had to spend a bit of time with a bent mortise chisel to chisel out the glue from the lip of the hole.

I will seal the hole and collar with epoxy to protect the wood. After I’m done fiberglassing the exterior of the boat, I’ll apply marine caulk on the lip of the hole, push the sleeve into the caulk, and clamp it in place. This will produce a waterproof seal that will give me great confidence.


In the next installment we’ll install the deck plywood.

-- Mark, Minnesota

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