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frankr: It seems like it should just slide in, as you say, but it doesn’t. The shaft and spline are enough undersized and have enough play so that the washer and disk can move in all directions. I’ve used a dab of marine grease to try to hold them in a relatively good position; but it has to be press fitted into the receiving hole, otherwise it wouldn’t seal. So it just get there and won’t line up. I thought that I might not be aggressive enough, but its a fine line between messing up the seal I have and not pushing hard enough. Then I though that I might fineness it. So, I came up with the dowel for centering and the plastic conduit sleeve to push with. Still wouldn’t seat. Anyway, I’m at max frustration so it’s a good time to take a break. I am sure that the gasket just needs broke loose on the powerhead. I will put some pressure on that tomorrow.
Lloyd: Good to hear from you. Yes, I bought 3 sets of seals from you and so glad you are out there for the community. I have a TD20, an HD25, and this TN28. Your drawing and instructions are super. Your seals go in and the crab gets a going over next. I was just green enough to think that the lower unit, impeller, and gear grease would be a piece of cake. Then I got edumacated.