As long as you completely coated the inside of the hole in the transom with 5200 before you inserted the coated brass tube you'll be fine. The trick is to keep any water from going around the outside of the tube and soaking the wood in the transom, both from the inside and the outside. Baring that, a nice layer right on the flanges with 5200 will work also. 5200 is awesome stuff. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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