Try replacing the tube first. Go from there. The seal can go bad on those.especially when it's removed......that's why the books say replace the tranny dip stick tube and/or the oil dip stick tube if removed.
The early bird may get the worm, but the second mouse gets the cheese!!!
Make sure it is bolted up at the top bracket also. This keeps it pushed down to seal.
If the hole is damaged, I'm not sure what will hold up. I'd test it in a bucket of Mercon-V first to see if it eats it up. The putty you mentioned, JB-weld, epoxy.
02 AL PI 4.6L, 02 GT MAF and air box, SCT tune by lonnie.
2.25" true duals, no cats, Borla XS mufflers.
96 trans with 300HP + gear change J-mod, Mark VIII TC, & Hayden 30K GVW cooler.
Solid Rubber engine and tranny mounts. Polly front-end, tranny crossmember, and IRS bushings.
3.73 TL, 93 Mark VIII DS. Tokico Blues all around.
PBR dual piston calipers in front, Rear Disc Brake Swap.
97 console. Cooper 225/60/16s. 14.874 @ 93.56 with 3.27 before 3.73 upgrade