If it's leaking from the bottom (the drain hole/tell-tale) then you have a mechanical seal failure. You will have to buy a complete set of seals, bearing, 'o'-rings and gaskets - basically everything that is supplied in the �50 OTR kit shown in the link mentioned earlier. There are no shortcuts. Complete replacement of these parts is the only option.

This thread covers the parts needed and what to do and this thread might be of help too.

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