Here's a picture of where I drilled ( both ends of the motor) and the oil I used.
The motor's shaft runs on bronze bushings, with a oil soaked felt around it , when the felt dries out the bushing starts to squeal .
If you decide to drill and oil the felt , let the oil soak in for 1/2 hour and then re-apply , 3 or 4 times then seal the hole with silicone sealant.
Use caution drilling , if the drill snags the felt it will ball up and not completely surround the bushing.
Windows 10 has hidden my picture .
I'll be back.