Permanent lube bearing
If you've done this lube three times on the same car then chances are that you are just putting off the inevitable of bearing failure. I've done what you spoke about several times on a 123 chassis where the blower is easier to get to, but it's only a temp fix for motor replacement seeing as the bearing are sealed and can't be replaced. I did notice that the aftermarket motors do seem to have a high quality roller bearing setup, and they're even American made. Might try one of these and save yourself the time of relubing a dying horse.
"Tell me and I will listen, Teach me and I will learn, Show me and I will accomplish, Involve me and I will succeed."
'84 300SD 256,000 Gold on Brown (Mileage Award)
'86 300E 246,000 Blue on Tan