I just replaced my centerboard hose. The stainless piping on my '80 Tartan had 4 screws holding it to the keel step. The gentle sweep of the piping allows the pennant to move freely. I feel confident that IF your current screws are not corroded, you have enough glass material under there to go up one size with new screws.
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IMG_20210123_095226486.jpg [ 2.98 MB | Viewed 0 times ] And yes, there is a piece of PVC attached to the top of the stainless steel.
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IMG_20210123_095232946.jpg [ 2.38 MB | Viewed 0 times ] We bought a dollar play ball from wallyworld and stuck it down the deck collar. Then we covered the ball with an old cheap raincoat and secured the raincoat with hose clamps. Then we used our fender pump to pressurize the ball so it wouldn't slip out.
Now if it was just that easy to seal the mast when it gets back.