Thanks for the attachment, joatman. I was pretty gentle on the tightness of the packing nut....didn't torque it as I didn't see this until now
I used a considerable amount of silicone grease on the outside of the shaft and inside diameter of the bushing/grommet before inserting the wiper motor through the glass. I sealed the area between the grommet and the shaft on the outside of the glass with silicone grease as well as the whole area prior to installing the washer/nut. I don't think there will be an issue to remove this one if required.
Thank you all for your input/comments.